fixed possibility of StopIteration Exception to happen with wrong written ternary operators

evaluate.py

@@ -1217,7 +1217,10 @@ def follow_call_list(call_list):
                         if str(call.name) == 'if':
                             # Ternary operators.
                             while True:
+                                try:
                                     call = next(calls_iterator)
+                                except StopIteration:
+                                    break
                                 try:
                                     if str(call.name) == 'else':
                                         break

test/completion/invalid.py

@@ -56,5 +56,10 @@ try:
         #? str()
         ""
 
+# wrong ternary
+a = 1 if
+#? int()
+a
+
 #? []
 int()).

test/completion/thirdparty/jedi_.py

@@ -32,5 +32,5 @@ el = list(evaluate.get_names_for_scope(1))[0][1]
 el = list(evaluate.get_names_for_scope())[0][1]
 
 # TODO here should stand evaluate.Instance() and so on.
-##? []
+#? 
 el = list(evaluate.get_names_for_scope())[0][1][0]