Optimised callbacks for PresetsOnlyParameterUI so they only do anything when the plug has been set. Also worked around problem where the plug could be dead already when a callback occurs for some other plug.
Optimised callbacks for PresetsOnlyParameterUI so they only do anything when the plug has been set. Also worked around problem where the plug could be dead already when a callback occurs for some other plug.

Alwnikrotikz/cortex-vfx,tectronics/cortex-vfx,AlanZatarain/cortex-vfx,Alwnikrotikz/cortex-vfx,tectronics/cortex-vfx,Alwnikrotikz/cortex-vfx,AlanZatarain/cortex-vfx,AlanZatarain/cortex-vfx,tectronics/cortex-vfx