Typechecker crashes when importing a module annotated with @ignoreCompiler{}

[PieterOlivier]

Describe the bug

When importing a module that has a @ignoreCompiler annotation, the typechecker will crash with a
"Rascal check crashed unexpectedly with: NoSuchKey" error.

To Reproduce
Create the following modules:

module ignored::RegularModule

import ignored::IgnoredModule;

and

@ignoreCompiler{Test ignored module}
module ignored::IgnoredModule

Now trigger a typecheck by saving the second module. The typechecker will crash with a "Rascal check crashed unexpectedly with: NoSuchKey" error.

Expected behavior
A warning or error message that typechecking encountered a module that is ignored.

Screenshots

Stack traces
Exception thrown:

|lib://rascal-core/lang/rascalcore/check/Import.rsc|:328,84: NoSuchKey("ignored::IgnoredModule")

Stacktrace:

	at prepareForCompilation(|lib://rascal-core/lang/rascalcore/check/Import.rsc|(14132,47,<328,67>,<328,114>))
	at rascalTModelForLocs(|lib://rascal-core/lang/rascalcore/check/Checker.rsc|(13495,77,<314,38>,<314,115>))
	at check(|lib://rascal-core/lang/rascalcore/check/Checker.rsc|(22262,64,<547,9>,<547,73>))
	at $shell$(|main://$shell$|)

Version info
rascal version 0.41.0-RC13
rascal-core version 0.12.16