Mirror controls required target shape to exist

There was a bug where rigbits.mirror_control required a target shape to exist. If the shape did not exist already, two errors occurred.
1. cnx was an undeclared variable
2. Getting the color of the target shape returned None and then tried to set color to None.

scripts/mgear/rigbits/__init__.py

@@ -395,6 +395,7 @@ def replaceShape(source=None, targets=None, *args):
     for target in targets:
         source2 = pm.duplicate(source)[0]
         shape = target.getShapes()
+        cnx = []
         if shape:
             cnx = shape[0].listConnections(plugs=True, c=True)
             cnx = [[c[1], c[0].shortName()] for c in cnx]

scripts/mgear/rigbits/mirror_controls.py

@@ -95,9 +95,11 @@ def mirror_pairs(pairs):
         pc.parent(source_copy, target)
         pc.makeIdentity(source_copy, apply=True, t=1, r=1, s=1, n=0)
         pc.parent(source_copy, target.getParent())
-        mgear.core.curve.set_color(
-            source_copy, mgear.core.curve.get_color(target)
-        )
+        targetColor = mgear.core.curve.get_color(target)
+        if targetColor:
+            mgear.core.curve.set_color(
+                source_copy, targetColor)
+            )
 
         # Replace shape
         mgear.rigbits.replaceShape(source_copy, [target])