xyz filter blank for number axes

scripts/xyz_grid.py

@@ -554,6 +554,8 @@ class Script(scripts.Script):
                 valslist_ext = []
 
                 for val in valslist:
+                    if val.strip() == '':
+                        continue
                     m = re_range.fullmatch(val)
                     mc = re_range_count.fullmatch(val)
                     if m is not None:
@@ -576,6 +578,8 @@ class Script(scripts.Script):
                 valslist_ext = []
 
                 for val in valslist:
+                    if val.strip() == '':
+                        continue
                     m = re_range_float.fullmatch(val)
                     mc = re_range_count_float.fullmatch(val)
                     if m is not None: