actually not showing components without representation

wani.py

@@ -177,9 +177,6 @@ class ComponentRepresentation:
     def render(self):
         if self.rendition_text is None:
             self.rendition_text = self._render()
-    
-    def rendition(self):
-        return "" if self.rendition_text is None else self.rendition_text
 
     def _render(self):
         raise NotImplementedError("Not implemented for class: {}".format(type(self)))
@@ -502,8 +499,13 @@ class ComponentRendition:
                 rep.render()
 
         for cid, reps in representations.items():
-            rep = " ".join(rep.rendition() for rep in reps)
-            matches.representations[cid] = rep
+            reps = [rep.rendition_text for rep in reps]
+            if len(reps) == 0:
+                pass
+            elif all(r is None for r in reps):
+                matches.representations[cid] = None
+            else:
+                matches.representations[cid] = " ".join(("" if r is None else r) for r in reps)
         
         # # just need to set representation to first group,
         # # but in correct order, agreements last!