Handle exceptions thrown on reflection based calls

[jbartok]

Fixes #https://github.com/gradle/gradle-private/issues/4114

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[h0tk3y]

An integration test would be in order, as mentioned in the discussion. We have tests with custom plugins in DeclarativeDslProjectBuildFileIntegrationSpec which might be an example (or something you might want to improve as well if you have better test fixtures for plugins).

[jbartok]

@bot-gradle test this

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[jbartok]

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