Fix get current squash.

pym/cl_fill_builder.py

@@ -327,8 +327,12 @@ class fillVars(object, varsShare):
         Variable keep value of squash image which will created by squash command
         """
         oldSquash = self.Get('cl_builder_old_squash')
-        newNum = self.getSquashNum(Distributive.reLive.search(oldSquash))+1
-        return "livecd.squashfs.%d"%newNum
+        reOldSquash = Distributive.reLive.search(oldSquash)
+        if reOldSquash:
+            newNum = self.getSquashNum(reOldSquash)+1
+            return "livecd.squashfs.%d"%newNum
+        else:
+            return "livecd.squashfs"
 
     def get_cl_builder_old_squash(self):
         """