PEP8 and minor cleanups, fixes.

mayan/apps/documents/models.py

@@ -21,7 +21,7 @@ from converter import (
     TransformationZoom
 )
 from converter.exceptions import (
-    InvalidOfficeFormat, PageCountError, UnknownFileFormat
+    InvalidOfficeFormat, PageCountError
 )
 from converter.literals import DEFAULT_ZOOM_LEVEL, DEFAULT_ROTATION
 from converter.models import Transformation

mayan/apps/documents/test_api.py

@@ -15,7 +15,7 @@ from .models import Document, DocumentType
 from .test_models import (
     TEST_ADMIN_EMAIL, TEST_ADMIN_PASSWORD, TEST_ADMIN_USERNAME,
     TEST_DOCUMENT_FILENAME, TEST_DOCUMENT_PATH, TEST_DOCUMENT_TYPE,
-    TEST_SMALL_DOCUMENT_FILENAME, TEST_SMALL_DOCUMENT_PATH,
+    TEST_SMALL_DOCUMENT_PATH,
 )