NPE in BinaryModuleBinding.create() during incremental compile

When using Eclipse 4.25, we ran into the following NPE (once):

```
java.lang.NullPointerException: Cannot invoke "org.eclipse.jdt.internal.compiler.env.IModule.isAutomatic()" because "module" is null
at org.eclipse.jdt.internal.compiler.lookup.BinaryModuleBinding.create(BinaryModuleBinding.java:99)
at org.eclipse.jdt.internal.compiler.impl.ITypeRequestor.accept(ITypeRequestor.java:65)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getModuleFromAnswer(LookupEnvironment.java:437)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForTypeFromModules(LookupEnvironment.java:374)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:236)
at org.eclipse.jdt.internal.compiler.lookup.UnresolvedReferenceBinding.resolve(UnresolvedReferenceBinding.java:114)
at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.resolveType(BinaryTypeBinding.java:249)
at org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage(PackageBinding.java:252)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.findImport(CompilationUnitScope.java:551)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.findSingleImport(CompilationUnitScope.java:623)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.faultInImports(CompilationUnitScope.java:452)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.faultInTypes(CompilationUnitScope.java:525)
at org.eclipse.jdt.internal.compiler.Compiler.process(Compiler.java:898)
at org.eclipse.jdt.internal.compiler.ProcessTaskManager.run(ProcessTaskManager.java:145)
at java.base/java.lang.Thread.run(Thread.java:833)
```

To my knowledge we have no module definitions.

Start at org.eclipse.jdt.internal.compiler.lookup.BinaryModuleBinding.create(), especially BinaryModuleBinding.java:99, and trace the null module through LookupEnvironment.getModuleFromAnswer() during incremental compilation. Reproduce the intermittent NPE despite having no module definitions, then confirm the compiler handles this case without the exception and add coverage for the regression.

Written by the indexing model from the issue text.