Conversion pipeline: Don't die if rescaling of image raises an exception, just ignore and continue

src/calibre/ebooks/oeb/transforms/rescale.py

@@ -72,10 +72,13 @@ class RescaleImages(object):
                                 Qt.IgnoreAspectRatio, Qt.SmoothTransformation)
                         data = pixmap_to_data(img, format=ext)
                     else:
+                        try:
                             im = im.resize((int(new_width), int(new_height)), PILImage.ANTIALIAS)
                             of = cStringIO.StringIO()
                             im.convert('RGB').save(of, ext)
                             data = of.getvalue()
+                        except:
+                            self.log.exception('Failed to rescale image')
                     if data is not None:
                         item.data = data
                         item.unload_data_from_memory()