Check if the plugin is available.
A plugin is marked as not available when there is no loader available to load it, or when there has been an error when trying to load it previously. If not available then @error will be set.
%TRUE if the plugin is available.
GException on failure.
See Implementation
Check if the plugin is available.
A plugin is marked as not available when there is no loader available to load it, or when there has been an error when trying to load it previously. If not available then @error will be set.