Fix: clean __init__

mapytex/calculus/API/tokens/polynomial.py

@@ -33,14 +33,9 @@ class Polynomial(Token):
     def __init__(self, a, name="", ancestor=None):
         """ Initiate Polynomial with a MO"""
         if not isinstance(a, MO):
-            if isinstance(a, str):
-                raise TypeError
-            else:
-                raise TypeError
-        else:
-            mo = a
+            raise TypeError
 
-        Token.__init__(self, mo, name, ancestor)
+        Token.__init__(self, a, name, ancestor)
         self._mathtype = "polynome"
 
     @classmethod