Fix crash on invalid prefix imports. #1899
Merged
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Fixes #1896.
@isoos
Ideally, we'd be able to use analyzer warnings/errors to put out a nice error message here, but there are a lot of complications and blocking issues for doing that internally to dartdoc. For now, just drop the invalid prefix import to avoid the crash and assume the fact that the package doesn't work at all will supercede people from caring about minor inaccuracies in the generated docs.