Fix singletons in labels

src/label_studio_sdk/label_interface/control_tags.py

@@ -270,11 +270,11 @@ def find_object_by_name(self, name: str) -> Optional[ObjectTag]:
 
     def _validate_labels(self, labels):
         """Check that labels is a subset of self.labels, used for
-        example when you're validate the annotaion or prediction to
+        example when you're validate the annotation or prediction to
         make sure there no undefined labels used.
 
         """
-        if not self.labels:
+        if not self.labels or not labels:
             return True
 
         return set(labels).issubset(set(self.labels))
@@ -424,7 +424,7 @@ def _label_with_labels(
             )
 
         kwargs[self._label_attr_name] = label
-
+        
         return self._label_simple(to_name=to_name, **kwargs)
 
     def label(
@@ -455,7 +455,7 @@ def label(
         Region
             A new Region object with the specified label applied.
         """
-        if hasattr(self, "_label_attr_name"):
+        if hasattr(self, "_label_attr_name") and label is not None:
             return self._label_with_labels(
                 label=label, to_name=to_name, *args, **kwargs
             )

src/label_studio_sdk/label_interface/interface.py

@@ -320,7 +320,7 @@ def create_regions(self, data: Dict[str, Union[str, Dict, List[str], List[Dict]]
             # 1. we should allow control.label to process custom payload outside of those strictly containing "label"
             # 2. we should be less open regarding the payload type and defining the strict typing elsewhere,
             # but likely that requires rewriting of how ControlTag.label() is working now
-            if isinstance(payload, str):
+            if isinstance(payload, (str, int, float)):
                 payload = {'label': payload}
             elif isinstance(payload, list):
                 if len(payload) > 0:
@@ -331,6 +331,7 @@ def create_regions(self, data: Dict[str, Union[str, Dict, List[str], List[Dict]]
 
             if isinstance(payload, Dict):
                 payload = [payload]
+
             for item in payload:
                 regions.append(control.label(**item))