IDE throws NullPointerException from javac on opening file

### Apache NetBeans version

Apache NetBeans 29 latest daily build

### What happened

Opening some files in Java + Kotlin multi-module Gradle project throws NPE from nbjavac code:
```
Caused: java.lang.NullPointerException: Cannot invoke "com.sun.tools.javac.code.Symbol.flags()" because "sym" is null
at com.sun.tools.javac.code.Types.memberType(Types.java:2304)
at com.sun.tools.javac.comp.Attr.isBooleanOrNumeric(Attr.java:2141)
at com.sun.tools.javac.comp.Attr.isBooleanOrNumeric(Attr.java:2130)
at com.sun.tools.javac.comp.Attr.visitConditional(Attr.java:2068)
at com.sun.tools.javac.tree.JCTree$JCConditional.accept(JCTree.java:1580)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:677)
at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:723)
at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1317)
at org.netbeans.lib.nbjavac.services.NBAttr.visitVarDef(NBAttr.java:99)
at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:1066)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:677)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:751)
at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:770)
at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1463)
at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:92)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1136)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:677)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:751)
at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1244)
at org.netbeans.lib.nbjavac.services.NBAttr.visitMethodDef(NBAttr.java:86)
at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:960)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:677)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:751)
at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:5664)
at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:5550)
at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:5365)
at org.netbeans.lib.nbjavac.services.NBAttr.attribClass(NBAttr.java:74)
at com.sun.tools.javac.comp.Attr.attrib(Attr.java:5302)
at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1346)
at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1319)
at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:404)
at com.sun.tools.javac.api.JavacTaskImpl.lambda$analyze$1(JavacTaskImpl.java:379)
at com.sun.tools.javac.api.JavacTaskImpl.invocationHelper(JavacTaskImpl.java:152)
at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:379)
Caused: java.lang.IllegalStateException
at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:383)
at org.netbeans.modules.java.source.parsing.JavacParser.moveToPhase(JavacParser.java:765)
at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:536)
at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:140)
at org.netbeans.modules.parsing.impl.TaskProcessor.callGetResult(TaskProcessor.java:608)
at org.netbeans.modules.parsing.impl.SourceCache.getResult(SourceCache.java:241)
at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:775)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:288)
at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:702)
[catch] at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:663)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1403)
at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:287)
at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2018)
```

### Language / Project Type / NetBeans Component

Java + Kotlin multi-module Gradle project

### How to reproduce

Open GH project: https://github.com/makiam/Tokonga
Module: Translators
Open File OBJExporter.java

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Ubuntu and/or Windows

### JDK

Java: 17.0.10; OpenJDK 64-Bit Server VM 17.0.10+13-LTS

### Apache NetBeans packaging

Other

### Anything else

IDE dump file
[OBJExporter_2.zip](https://github.com/user-attachments/files/23852197/OBJExporter_2.zip)

### Are you willing to submit a pull request?

No

Reproduce the failure in the Tokonga project's Translators module by opening OBJExporter.java, using the attached IDE dump if needed. Start with the stack trace entries for org.netbeans.lib.nbjavac.services.NBAttr and JavacParser.moveToPhase, then compare the behavior while opening the file. Done means the file opens without the reported NullPointerException.

Written by the indexing model from the issue text.