Settings loader fix for not set range check entries

If we have a range or length check and the value is not set, skip, and do not convert either
Not set is None

src/corelibs/config_handling/settings_loader.py

@@ -331,6 +331,9 @@ class SettingsLoader:
         (__from, __to, __equal) = check
         valid = True
         for value_raw in convert_to_list(values):
+            # skip no tset values for range check
+            if not value_raw:
+                continue
             value = 0
             error_mark = ''
             if check_type == 'length':

test-run/config_handling/config/settings.ini

@@ -9,6 +9,7 @@ other_list=a|b|c|d|
 third_list=xy|ab|df|fg
 str_length=foobar
 int_range=20
+int_range_not_set=
 #
 match_target=foo
 match_target_list=foo,bar,baz

test-run/config_handling/settings_loader.py

@@ -63,6 +63,9 @@ def main():
                 "int_range": [
                     "range:2-50"
                 ],
+                "int_range_not_set": [
+                    "range:2-50"
+                ],
                 "match_target": ["matching:foo"],
                 "match_target_list": ["split:,", "matching:foo|bar|baz",],
                 "match_source_a": ["in:match_target"],