java.lang.NullPointerException on SameNameButDifferent

Error obtained with maven 3.8.5 and Java 11.0.14 with the following config:

```

org.apache.maven.plugins
maven-compiler-plugin

${maven.compiler.source}
${maven.compiler.target}
${maven.compiler.release}
${project.build.sourceEncoding}
false
false


org.springframework.boot
spring-boot-configuration-processor
${spring-boot-starter-parent.version}


org.mapstruct
mapstruct-processor
${org.mapstruct.version}


org.projectlombok
lombok
${lombok.version}


org.projectlombok
lombok-mapstruct-binding
${lombok-mapstruct-binding.version}


org.springframework
spring-context-indexer
${spring-framework.version}


com.github.therapi
therapi-runtime-javadoc-scribe
${therapi-runtime-javadoc-scribe.version}


com.google.errorprone
error_prone_core
${error_prone.version}




-Amapstruct.defaultComponentModel=spring
-Amapstruct.defaultInjectionStrategy=constructor
-XDcompilePolicy=simple
-Xplugin:ErrorProne



```

```
[ERROR] error-prone version: 2.14.0
[ERROR] BugPattern: SameNameButDifferent
[ERROR] Stack Trace:
[ERROR] java.lang.NullPointerException
[ERROR] at com.google.errorprone.bugpatterns.SameNameButDifferent.getBetterImport(SameNameButDifferent.java:186)
[ERROR] at com.google.errorprone.bugpatterns.SameNameButDifferent.matchCompilationUnit(SameNameButDifferent.java:141)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.processMatchers(ErrorProneScanner.java:449)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitCompilationUnit(ErrorProneScanner.java:555)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitCompilationUnit(ErrorProneScanner.java:150)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:591)
[ERROR] at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:56)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:58)
[ERROR] at com.google.errorprone.scanner.ErrorProneScannerTransformer.apply(ErrorProneScannerTransformer.java:43)
[ERROR] at com.google.errorprone.ErrorProneAnalyzer.finished(ErrorProneAnalyzer.java:152)
[ERROR] at jdk.compiler/com.sun.tools.javac.api.MultiTaskListener.finished(MultiTaskListener.java:132)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1418)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1365)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:960)
[ERROR] at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:104)
[ERROR] at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.handleExceptions(JavacTaskImpl.java:147)
[ERROR] at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:100)
[ERROR] at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:94)
[ERROR] at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:136)
[ERROR] at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:182)
[ERROR] at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:1209)
[ERROR] at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:198)
[ERROR] at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute(MojoExecutor.java:301)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:211)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:165)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:157)
[ERROR] at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:121)
[ERROR] at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
[ERROR] at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56)
[ERROR] at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:127)
[ERROR] at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:294)
[ERROR] at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192)
[ERROR] at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105)
[ERROR] at org.apache.maven.cli.MavenCli.execute(MavenCli.java:960)
[ERROR] at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:293)
[ERROR] at org.apache.maven.cli.MavenCli.main(MavenCli.java:196)
[ERROR] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[ERROR] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[ERROR] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[ERROR] at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)
```