Fixed bug in non-editable MultiLineStringPlugValueWidgets.
Fixed bug in non-editable MultiLineStringPlugValueWidgets.

It was trying to set the value of the plug, even when the plug was read only or had an input connection.

boberfly/gaffer,lucienfostier/gaffer,goddardl/gaffer,johnhaddon/gaffer,hradec/gaffer,appleseedhq/gaffer,ImageEngine/gaffer,ivanimanishi/gaffer,cedriclaunay/gaffer,goddardl/gaffer,hradec/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,cedriclaunay/gaffer,boberfly/gaffer,lucienfostier/gaffer,ivanimanishi/gaffer,davidsminor/gaffer,appleseedhq/gaffer,davidsminor/gaffer,GafferHQ/gaffer,boberfly/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,andrewkaufman/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,boberfly/gaffer,GafferHQ/gaffer,hradec/gaffer,goddardl/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,chippey/gaffer,hradec/gaffer,davidsminor/gaffer,chippey/gaffer,appleseedhq/gaffer,GafferHQ/gaffer,ivanimanishi/gaffer,chippey/gaffer,lucienfostier/gaffer,chippey/gaffer,goddardl/gaffer,johnhaddon/gaffer,cedriclaunay/gaffer,andrewkaufman/gaffer,davidsminor/gaffer,hradec/gaffer,cedriclaunay/gaffer,lucienfostier/gaffer