Fixed flake8 F523

.flake8

@@ -3,4 +3,4 @@ max-line-length=120
 exclude=pystencils/jupyter.py,
         pystencils/plot.py
         pystencils/session.py
-ignore = W293 W503 W291 C901
+ignore = W293 W503 W291 C901 E741

pystencils/astnodes.py

@@ -117,7 +117,7 @@ class Conditional(Node):
         if self.true_block:
             repr += '\n\t{}) '.format(self.true_block)
         if self.false_block:
-            repr = 'else: '.format(self.false_block)
+            repr = 'else: '
             repr += '\n\t{} '.format(self.false_block)
 
         return repr