ERROR "version can neither be null, empty nor blank" with unresolved Maven Property in additionalDependencies

### Affected version

3.12.0

### Bug description

Getting this ERROR though even "-X" is **not** telling me which Artifact is making the problem.
To make it more verbose about the artifact that's causing issues, this line
https://github.com/apache/maven-javadoc-plugin/blob/maven-javadoc-plugin-3.12.0/src/main/java/org/apache/maven/plugins/javadoc/AbstractJavadocMojo.java#L2607
should catch any exception and render the artifact in question.

Somewhat related: https://github.com/apache/maven-resolver/issues/1269

```
[DEBUG] add additional artifact with path C:\dev\M3_REPO\org\apache\logging\log4j\log4j-core\2.25.2\log4j-core-2.25.2.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 28.878 s (Wall Clock)
[INFO] Finished at: 2025-11-16T22:10:23+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.12.0:javadoc (attach-javadocs) on project NNN: Execution attach-javadocs of goal org.apache.maven.plugins:maven-javadoc-plugin:3.12.0:javadoc failed: version can neither be null, empty nor blank -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.12.0:javadoc (attach-javadocs) on project NNN: Execution attach-javadocs of goal org.apache.maven.plugins:maven-javadoc-plugin:3.12.0:javadoc failed: version can neither be null, empty nor blank
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:333)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000 (MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run (MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute (DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:159)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:105)
at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:193)
at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:180)
at java.util.concurrent.FutureTask.run (FutureTask.java:264)
at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:539)
at java.util.concurrent.FutureTask.run (FutureTask.java:264)
at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1136)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:635)
at java.lang.Thread.run (Thread.java:840)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution attach-javadocs of goal org.apache.maven.plugins:maven-javadoc-plugin:3.12.0:javadoc failed: version can neither be null, empty nor blank
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:133)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:328)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000 (MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run (MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute (DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:159)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:105)
at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:193)
at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:180)
at java.util.concurrent.FutureTask.run (FutureTask.java:264)
at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:539)
at java.util.concurrent.FutureTask.run (FutureTask.java:264)
at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1136)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:635)
at java.lang.Thread.run (Thread.java:840)
Caused by: java.lang.IllegalArgumentException: version can neither be null, empty nor blank
at org.apache.commons.lang3.Validate.notBlank (Validate.java:782)
at org.apache.maven.artifact.ArtifactUtils.notBlank (ArtifactUtils.java:94)
at org.apache.maven.artifact.ArtifactUtils.key (ArtifactUtils.java:86)
at org.apache.maven.ReactorReader.findArtifact (ReactorReader.java:96)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve (DefaultArtifactResolver.java:350)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts (DefaultArtifactResolver.java:261)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact (DefaultArtifactResolver.java:243)
at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact (DefaultRepositorySystem.java:278)
at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.resolveDependency (AbstractJavadocMojo.java:2605)
at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.getPathElements (AbstractJavadocMojo.java:2579)
at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.addJavadocOptions (AbstractJavadocMojo.java:4554)
at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.executeReport (AbstractJavadocMojo.java:1998)
at org.apache.maven.plugins.javadoc.JavadocReport.generate (JavadocReport.java:142)
at org.apache.maven.plugins.javadoc.JavadocReport.doExecute (JavadocReport.java:307)
at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.execute (AbstractJavadocMojo.java:1851)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:126)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:328)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000 (MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run (MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute (DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:159)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:105)
at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:193)
at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:180)
at java.util.concurrent.FutureTask.run (FutureTask.java:264)
at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:539)
at java.util.concurrent.FutureTask.run (FutureTask.java:264)
at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1136)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:635)
at java.lang.Thread.run (Thread.java:840)
[ERROR]
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException

```

adding
`true`
or
`true`
did not help to pinpoint the problem.

Then, turned out I was using

```

jakarta.servlet
jakarta.servlet-api
${version.servlet}

```

and the property `version.servlet` was not set! So I wonder why this resolved to a **blank string**!?
Which mechanism resolved to a (presumably) blank string and should not there be a warning about unresolved properties?

Start at src/main/java/org/apache/maven/plugins/javadoc/AbstractJavadocMojo.java around line 2607, following resolveDependency from the reported stack trace. Investigate how the additionalDependency version property becomes blank and determine how the failing artifact can be identified in the error or warning. Done means the unresolved dependency is clearly reported when this configuration is processed.

Written by the indexing model from the issue text.