mid component should be colocation, not headword,

Also, readd structureName and handle unknown structure when importing ske collocation

src/message/ske_messages.py

@@ -58,7 +58,15 @@ class SkeCollocation:
     def __init__(self, data):
         self.word = data.word
         self.frequency = data.count
-        self.structure_name, self.structure_id = convert_structure(data.gramrel)
+        
+        info = convert_structure(data.gramrel)
+        if info is None:
+            self.structure_name = None
+            self.structure_id = None
+        else:
+            self.structure_name = info[0]
+            self.structure_id = info[1]
+            
         
         self.other = {"score": data.score, "cm": data.cm}
 
@@ -243,6 +251,7 @@ class SkeInsert(DataChgClickMessage):
         new_collocation.inner = MultiwordExample()
         
         new_collocation.inner.other_attributes["structure_id"] = example.structure_id
+        new_collocation.inner.other_attributes["structureName"] = example.structure_name
         new_collocation.inner.other_attributes["logDice"] = example.other["score"]
         new_collocation.inner.other_attributes["frequency"] = example.frequency
         new_collocation.inner.type = "collocation"
@@ -253,7 +262,7 @@ class SkeInsert(DataChgClickMessage):
         
         lex_mid = ComponentLexeme()
         lex_mid.text = example.word
-        lex_mid.role = "headword"
+        lex_mid.role = "collocation"
         
         lex_right = ComponentLexeme()
         lex_right.text = ""