Fix #614 - Improve errors in valid-v-on, detect forbidden keywords #642
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This PR improves error message pointed in #614. By default if there is no value or one of the two verb modifiers we throw an error, but if someone attempts to use forbidden JS keyword the parser stripes it from AST and we throw the wrong message. Now I'm making sure that the value is really empty, both in the AST and in the code itself, otherwise the rule will throw a message about forbidden value.