fix UnboundLocalError and TypeError within Array lookups, not a very good solution, but for now it doesn't puke errors

jedi/evaluate_representation.py

@@ -814,7 +814,10 @@ class Array(use_metaclass(cache.CachedMetaClass, pr.Base)):
                 if isinstance(index, Instance) \
                         and str(index.name) in ['int', 'str'] \
                         and len(index.var_args) == 1:
-                    with common.ignored(KeyError, IndexError):
+                    # TODO this is just very hackish and a lot of use cases are
+                    # being ignored
+                    with common.ignored(KeyError, IndexError,
+                                        UnboundLocalError, TypeError):
                         return self.get_exact_index_types(index.var_args[0])
 
         result = list(self._follow_values(self._array.values))

test/completion/arrays.py

@@ -11,6 +11,8 @@
 [1,""][2]
 #? int() str()
 [1,""][20]
+#? int() str()
+[1,""][str(hello)]
 
 a = list()
 #? list()
@@ -215,6 +217,11 @@ def y(a):
 #? 
 y(**d)
 
+# problem with more complicated casts
+dic = {str(key): ''}
+#? str()
+dic['']
+
 # -----------------
 # with variable as index
 # -----------------