multiple_int_param: ignore multiple spaces (#2255)

lib/elements/element.py

@@ -146,7 +146,7 @@ class EmbroideryElement(object):
     def get_multiple_int_param(self, param, default="0"):
         params = self.get_param(param, default).split(" ")
         try:
-            params = [int(param) for param in params]
+            params = [int(param) for param in params if param]
         except (TypeError, ValueError):
             return [default]
         return params