plugin.py: Don't make a double lookup in the plugin table to get one

Benjamin Schubertrequested to merge
bschubert/fix-double-lookup into master

Description

Remove a double lookup in the Plugin.__TABLE when getting a plugin by id.

This will speedup all invocations of this method.

The assert False is necessary in order to keep the same behavior as before (raising a KeyError whenever we run with python -O).

Changes proposed in this merge request:

  • Don't make a double lookup in Plugin.__TABLE

This merge request, when approved, will close:

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