Move Pillow initialization

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

HISTORY.rst

@@ -74,6 +74,8 @@
 * Move language choices generation to documents.utils.
 * Remove support for generating documents images in base 64
   format.
+* Move Pillow initialization from the module to the backend
+  class initialization.
 
 3.1.11 (2019-04-XX)
 ===================

docs/releases/3.2.rst

@@ -106,6 +106,8 @@ Other changes
 * Move language choices generation to documents.utils.
 * Remove support for generating documents images in base 64
   format.
+* Move Pillow initialization from the module to the backend
+  class initialization.
 
 Removals
 --------

mayan/apps/converter/backends/python.py

@@ -67,7 +67,6 @@ try:
 except sh.CommandNotFound:
     pdfinfo = None
 
-Image.init()
 logger = logging.getLogger(__name__)
 
 
@@ -82,6 +81,9 @@ class IteratorIO(object):
 
 
 class Python(ConverterBase):
+    def __init__(self, *args, **kwargs):
+        super(Python, self).__init__(*args, **kwargs)
+        Image.init()
 
     def convert(self, *args, **kwargs):
         super(Python, self).convert(*args, **kwargs)