Fix empty mask overlay handling when no objects are detected. (#350)

Author: ro-hit81

samgeo/text_sam.py

@@ -342,7 +342,10 @@ def predict(
 
         if boxes.nelement() == 0:  # No "object" instances found
             print("No objects found in the image.")
-            return
+            mask_overlay = np.zeros_like(
+                image_np[..., 0], dtype=dtype
+            )  # Create an empty mask overlay
+
         else:
             # Create an empty image to store the mask overlays
             mask_overlay = np.zeros_like(