Fix: fraction rendering

mapytex/calculus/API/tokens/number.py

@@ -141,7 +141,7 @@ class Decimal(Token):
 
 class Fraction(Token):
 
-    """ Token representing a fraction
+    """ Token representing a fraction of numbers
 
     :example:
     >>> Fraction("3/4")

mapytex/calculus/API/tokens/token.py

@@ -54,10 +54,16 @@ class Token(object):
             yield self
 
     def __repr__(self):
-        return f"<{self.__class__.__name__} {render(self._mo, 'txt')}>"
+        try:
+            return f"<{self.__class__.__name__} {render(self._mo._tree, 'txt')}>"
+        except AttributeError:
+            return f"<{self.__class__.__name__} {render(self._mo, 'txt')}>"
 
     def __str__(self):
-        return render(self._mo)
+        try:
+            return render(self._mo._tree)
+        except AttributeError:
+            return render(self._mo)
 
     @property
     def raw(self):