Fix(Core): apply_on_last_level handle NotImplementedError

mapytex/calculus/core/__init__.py

@@ -35,9 +35,11 @@ Abstracts tools for calculs manipulations
  | > 3
  | > 4
 >>> print(t.apply_on_last_level(compute))
-Traceback (most recent call last):
-    ...
-NotImplementedError: Can't divide 2 int. Need to create a Fraction instead
++
+ > 2
+ > /
+ | > 3
+ | > 4
 >>> tt = t.apply_on_last_level(typing)
 >>> print(tt.apply_on_last_level(compute))
 +

mapytex/calculus/core/tree.py

@@ -330,6 +330,8 @@ class Tree(object):
         try:
             left_applied = self.left_value.\
                 apply_on_last_level(function)
+        except NotImplementedError:
+            left_applied = self.left_value
         except AttributeError:
             left_applied = self.left_value
             left_is_leaf = 1
@@ -338,6 +340,8 @@ class Tree(object):
         try:
             right_applied = self.right_value.\
                 apply_on_last_level(function)
+        except NotImplementedError:
+            right_applied = self.right_value
         except AttributeError:
             right_applied = self.right_value
             right_is_leaf = 1