Pymel was printing a lot of errors when plugins failed to load:
Pymel was printing a lot of errors when plugins failed to load:

<br># Error: pymel : Failed to get controlCommand list from resolverPluginDuplicate #
<br># Error: pymel : Failed to get modelEditorCommand list from resolverPluginDuplicate #
<br># Error: pymel : Failed to get tool list from resolverPluginDuplicate #
<br># Error: pymel : Failed to get command list from resolverPluginDuplicate #
<br># Error: pymel : Failed to get constraintCommand list from resolverPluginDuplicate #
<br># Error: pymel.core : Failed to get depend nodes list from resolverPluginDuplicate #

This change adds a test to validate that the plug-in was successfully loaded before processing its contents

assumptionsoup/pymel,assumptionsoup/pymel,AtonLerin/pymel,AtonLerin/pymel,david-lassonde-adsk/pymel,david-lassonde-adsk/pymel