simplify __contains__ by reusing getitem code

Author: jreback

pandas/src/hashtable_class_helper.pxi.in

@@ -887,23 +887,11 @@ cdef class MultiIndexHashTable(HashTable):
                     "result:\n{}\nmi:\n{}".format(alocs, result, mi))
 
     def __contains__(self, object key):
-        cdef:
-            khiter_t k
-            uint64_t value
-
         try:
-            value = self.mi._hashed_indexing_key(key)
-        except TypeError:
-            return False
-
-        k = kh_get_uint64(self.table, value)
-        if k != self.table.n_buckets:
-            loc = self.table.vals[k]
-            locs = np.array([loc], dtype=np.int64)
-            self._check_for_collisions(locs, key)
+            self.get_item(key)
             return True
-
-        return False
+        except (KeyError, ValueError, TypeError):
+            return False
 
     cpdef get_item(self, object key):
         cdef: