fix formating

Author: aerubanov

pymc/model/fgraph.py

@@ -320,7 +320,9 @@ def first_non_model_var(var):
             var, value, *dims = model_var.owner.inputs
             transform = model_var.owner.op.transform
             model.free_RVs.append(var)
-            model.create_value_var(var, transform=transform, default_transform=None, value_var=value)
+            model.create_value_var(
+                var, transform=transform, default_transform=None, value_var=value
+            )
             model.set_initval(var, initval=None)
         elif isinstance(model_var.owner.op, ModelObservedRV):
             var, value, *dims = model_var.owner.inputs