Add noop OCR driver.

noopocr.py

@@ -0,0 +1,11 @@
+from __future__ import absolute_import, unicode_literals
+
+from ..classes import OCRBackendBase
+
+
+class NoOpOCR(OCRBackendBase):
+    def __init__(self, *args, **kwargs):
+        super(NoOpOCR, self).__init__(*args, **kwargs)
+
+    def execute(self, *args, **kwargs):
+        """Don't do anything"""