Settings loader mandatory fixes

- mandatory empty check if empty list ([''])
- skip regex check if replace value is None -> allowed empty as empty if not mandatory

src/corelibs/config_handling/settings_loader.py

@@ -175,7 +175,9 @@ class SettingsLoader:
                 # - length: for string length
                 # - range: for int/float range check
                 # mandatory check
-                if check == "mandatory:yes" and not settings[config_id].get(entry):
+                if check == "mandatory:yes" and (
+                    not settings[config_id].get(entry) or settings[config_id].get(entry) == ['']
+                ):
                     error = True
                     self.__print(f"[!] Missing content entry for: {entry}", 'ERROR')
                 # skip if empty none
@@ -392,7 +394,8 @@ class SettingsLoader:
         clean: re.Pattern[str] | None = None
         if regex_clean is not None:
             clean = re.compile(regex_clean, re.VERBOSE)
-        if not check.search(value):
+        # value must be set if clean is None, else empty value is allowed and will fail
+        if (clean is None and value or clean) and not check.search(value):
             self.__print(
                 f"[!] Invalid content for '{entry}' with check '{validate}' and data: {value}",
                 'ERROR', print_error