Restrictions now always a list, removes/simplifies a bit of code

wani.py

@@ -539,7 +539,7 @@ class Component:
         self.status = status
         self.name = name
         self.idx = idx
-        self.restriction = None
+        self.restrictions = []
         self.next_element = []
         self.representation = []
         self.selection = {}
@@ -551,13 +551,13 @@ class Component:
 
     def set_restriction(self, restrictions_tag):
         if restrictions_tag is None:
-            self.restriction = Restriction(None)
+            self.restrictions = [Restriction(None)]
 
         elif restrictions_tag.tag == "restriction":
-            self.restriction = Restriction(restrictions_tag)
+            self.restrictions = [Restriction(restrictions_tag)]
 
         elif restrictions_tag.tag == "restriction_or":
-            self.restriction = [Restriction(el) for el in restrictions_tag]
+            self.restrictions = [Restriction(el) for el in restrictions_tag]
 
         else:
             raise RuntimeError("Unreachable")
@@ -626,22 +626,10 @@ class Component:
         return to_ret
 
     def _match_self(self, word):
-        matched = None
-
         # matching
-        if type(self.restriction) is list:
-            for restr in self.restriction:
-                matched = restr.match(word)
-                if matched: # match either
-                    break
-        else:
-            matched = self.restriction.match(word)
-
-        # recurse to next
-        if not matched:
-            return None
-        else:
-            return {self.idx: word}
+        for restr in self.restrictions:
+            if restr.match(word): # match either
+                return {self.idx: word}
 
     def _match_next(self, word):
         # matches for every component in links from this component