PDF: don't fail getting content information when pdf is empty

product/ERP5/Document/PDFDocument.py

@@ -234,13 +234,10 @@ class PDFDocument(Image):
 
   security.declareProtected(Permissions.AccessContentsInformation, 'getContentInformation')
   def getContentInformation(self):
+    """Returns the information about the PDF document with pdfinfo.
     """
-    Returns the information about the PDF document with
-    pdfinfo.
-
-    NOTE: XXX check that command exists and was executed
-    successfully
-    """
+    if not self.hasData():
+      return dict()
     try:
       return self._content_information.copy()
     except AttributeError:

product/ERP5OOo/tests/testDms.py

@@ -1323,6 +1323,12 @@ class TestDocument(TestDocumentMixin):
     content_information = document.getContentInformation()
     self.assertEquals('1', content_information['Pages'])    
 
+  def test_empty_PDF_content_information(self):
+    document = self.portal.document_module.newContent(portal_type='PDF')
+    content_information = document.getContentInformation()
+    # empty PDF have no content information
+    self.assertEquals(dict(), content_information)
+
   def test_PDF_content_content_type(self):
     upload_file = makeFileUpload('REF-en-001.pdf')
     document = self.portal.document_module.newContent(portal_type='PDF')