Campbell Barton
6a49041be3
A recent change from [0] added an assert when a string lookup was
performed on a collection item with no name-property,
but silently failed with release builds.
This isn't correct in a couple of ways.
The assert makes it seem like the RNA API needs to be updated when
it's in fact valid to have collection items without a name-property.
It also misleads script authors to silently fail since it implies a
key that exists would return a result.
Raise a TypeError exception when string lookups are attempted on
collections that don't support them.
This change also applies to get() & __contains__().
[0]: 5bb3a3f157
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