Nyall Dawson fbad91165c Add feature source test for QgsVectorLayerCache
While it's not a QgsFeatureSource subclass (yet), it behaves
just like one so when can run the feature source conformance
test suite over it.

Fix a few minor issues identified by the test suite, and one
potential crash (requesting an invalid id from a cache iterator
crashes qgis)
2017-06-08 16:59:21 +10:00
..
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