add try in subprocess pdf to png

src/docs/views/base_views.py

@@ -6,6 +6,7 @@ import tempfile
 from email.header import Header
 from time import time
 import simplejson as json
+import sys
 import subprocess as s
 from django.contrib import messages
 from django.db import DatabaseError
@@ -418,10 +419,12 @@ class BaseViews(object):
                     "-sOutputFile=%s" % os.path.join(tmp_dir, "page-%03d.png"),
                     "-f", filename
                     ]
-
+            # ghostscript.Ghostscript(*args) # TODO: check on ubuntu
+            try:
                 p = s.Popen(args=args, stdout=s.PIPE, stderr=s.PIPE)
-            # # ghostscript.Ghostscript(*args) # TODO: check on ubuntu
                 p.wait()
+            except OSError:
+                sys.exit("Error executing Ghostscript. Is it in your PATH?")
             os.remove(filename)
             filename = '%s.pdf' % self.get_filename(*args, **kwargs)
             imgs = glob.glob(os.path.join(tmp_dir, '*.png'))