fix: add error output for unsupported images (#2537)

* Raise Error on bad decode

* Move task arg pop to try block

* fix: prevent empty task from getting queued

---------

Co-authored-by: Manuel Schmid <dev@mash1t.de>

modules/gradio_hijack.py

@@ -17,7 +17,7 @@ from gradio_client.documentation import document, set_documentation_group
 from gradio_client.serializing import ImgSerializable
 from PIL import Image as _Image  # using _ to minimize namespace pollution
 
-from gradio import processing_utils, utils
+from gradio import processing_utils, utils, Error
 from gradio.components.base import IOComponent, _Keywords, Block
 from gradio.deprecation import warn_style_method_deprecation
 from gradio.events import (
@@ -275,7 +275,10 @@ class Image(
                 x, mask = x["image"], x["mask"]
 
         assert isinstance(x, str)
-        im = processing_utils.decode_base64_to_image(x)
+        try:
+            im = processing_utils.decode_base64_to_image(x)
+        except PIL.UnidentifiedImageError:
+            raise Error("Unsupported image type in input")
         with warnings.catch_warnings():
             warnings.simplefilter("ignore")
             im = im.convert(self.image_mode)