Raise and catch PageMissingError when revisions API result is incomplete

https://github.com/WikiTeam/wikiteam/issues/317

dumpgenerator.py

@@ -871,7 +871,15 @@ def getXMLRevisions(config={}, session=None, allpages=False):
                 for result in results:
                     pages = result['query']['pages']
                     for page in pages:
-                        yield makeXmlFromPage(pages[page])
+                        try:
+                            xml = makeXmlFromPage(pages[page])
+                        except PageMissingError:
+                            logerror(
+                                config=config,
+                                text=u'Error: empty revision from API. Could not export page: %s' % (title.decode('utf-8'))
+                            )
+                            continue
+                        yield xml
 
     except wikitools.api.APIError:
         print "This wikitools version seems not to work for us. Exiting."
@@ -879,6 +887,7 @@ def getXMLRevisions(config={}, session=None, allpages=False):
 
 def makeXmlFromPage(page):
     """ Output an XML document as a string from a page as in the API JSON """
+    try:
         p = E.page(
                 E.title(page['title']),
                 E.ns(to_unicode(page['ns'])),
@@ -896,11 +905,13 @@ def makeXmlFromPage(page):
                 E.text(rev['*'], space="preserve", bytes=to_unicode(rev['size'])),
             )
             if 'contentmodel' in rev:
-            revision.append(E.model(rev['contentmodel'])
+                revision.append(E.model(rev['contentmodel']))
             # The sha1 may not have been backfilled on older wikis or lack for other reasons (Wikia).
             if 'sha1' in rev:
                 revision.append(E.sha1(rev['sha1']))
             p.append(revision)
+    except KeyError:
+        raise PageMissingError(page['title'], '')
     return etree.tostring(p, pretty_print=True)
 
 def readTitles(config={}, start=None):