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stats/grammar: Raise meaningful error when asked to parse bad event

Darryl Green requested to merge github/fork/bjackman/grammar-error-no-parser into master

Created by: bjackman

If you typo a trace event name in a call to Parser.solve, you currently get a KeyError from trying to access the result of globals(); the stacktrace goes through a pyparsing callback to str_to_attr via _pre_process ("""Pre-process accessors for super-indexing""")...

Add an exception with a message to hint at what went wrong.

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