Fix: Handle empty captions

This commit addresses an issue where empty captions were causing unexpected behavior. The logic for loading and displaying captions has been updated to check if the caption is both not None and has a length greater than 0. This prevents attempting to set empty captions, which could lead to unnecessary dock widget creation

annolid/gui/app.py

@@ -2477,7 +2477,7 @@ def loadShapes(self, shapes, replace=True):
             caption = self.labelFile.get_caption() if self.labelFile else None
         except AttributeError:
             caption = None
-        if caption is not None:
+        if caption is not None and len(caption) > 0:
             if self.caption_widget is None:
                 self.openCaption()
             self.caption_widget.set_caption(
@@ -2527,7 +2527,7 @@ def loadPredictShapes(self, frame_number, filename):
                 if self.labelFile:
                     self.loadLabels(self.labelFile.shapes)
                     caption = self.labelFile.get_caption()
-                    if caption is not None:
+                    if caption is not None and len(caption) > 0:
                         if self.caption_widget is None:
                             self.openCaption()
                         self.caption_widget.set_caption(caption)