Merge pull request #21416 from jffmichi/custom_gcode_allow_empty_lines

CAM: allow empty lines in Custom operation

src/Mod/CAM/Path/Post/scripts/linuxcnc_post.py

@@ -347,7 +347,7 @@ def parse(pathobj):
                 if command == lastcommand:
                     outstring.pop(0)
 
-            if c.Name[0] == "(" and not OUTPUT_COMMENTS:  # command is a comment
+            if c.Name.startswith("(") and not OUTPUT_COMMENTS:  # command is a comment
                 continue
 
             # Now add the remaining parameters in order