dont fail parsing parts of the pdf

oml/media/pdf.py

@@ -131,7 +131,10 @@ def info(pdf):
             toc = parse_tableofcontents(pdfreader)
             if toc:
                 data['tableofcontents'] = toc
-            info = pdfreader.getDocumentInfo()
+            try:
+                info = pdfreader.getDocumentInfo()
+            except:
+                info = None
             if info:
                 for key in info:
                     if info[key]:
@@ -144,8 +147,10 @@ def info(pdf):
                             data[key[1:].lower()] = value
                         except:
                             pass
-
-            xmp = pdfreader.getXmpMetadata()
+            try:
+                xmp = pdfreader.getXmpMetadata()
+            except:
+                xmp = None
             if xmp:
                 for key in dir(xmp):
                     if key.startswith('dc_'):