[bug] [factorisation] removed remaining validity checks is_valid

plotter.py

@@ -266,11 +266,6 @@ class Plotter(Aggregator, BaseProcessor):
         else:
             name_full = name
 
-        # Exit if not valid
-        if not rule.is_valid(arg):
-            self._log("{} is not valid in this context".format(name_full), "ERROR")
-            return
-
         # get filetype of the output
         filetype = filetype_from_ext[self.pp_params.out.ext]