Catch missing titles file and JSON response

Traceback (most recent call last):
  File "dumpgenerator.py", line 2214, in <module>
    print 'Trying to use path "%s"...' % (config['path'])
  File "dumpgenerator.py", line 2210, in main
    elif reply.lower() in ['no', 'n']:
  File "dumpgenerator.py", line 1977, in saveSiteInfo

  File "dumpgenerator.py", line 1711, in getJSON
    return False
  File "/usr/lib/python2.7/site-packages/requests/models.py", line 892, in json
    return complexjson.loads(self.text, **kwargs)
  File "/usr/lib64/python2.7/site-packages/simplejson/__init__.py", line 516, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python2.7/site-packages/simplejson/decoder.py", line 374, in decode
    obj, end = self.raw_decode(s)
  File "/usr/lib64/python2.7/site-packages/simplejson/decoder.py", line 404, in raw_decode
    return self.scan_once(s, idx=_w(s, idx).end())
simplejson.scanner.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Or if for instance the directory was named compared to the saved config:

Resuming previous dump process...
Traceback (most recent call last):
  File "./dumpgenerator.py", line 2238, in <module>
    main()
  File "./dumpgenerator.py", line 2228, in main
    resumePreviousDump(config=config, other=other)
  File "./dumpgenerator.py", line 1829, in resumePreviousDump
    if lasttitle == '--END--':
UnboundLocalError: local variable 'lasttitle' referenced before assignment

dumpgenerator.py

@@ -1729,7 +1729,11 @@ def getJSON(request):
     """Strip Unicode BOM"""
     if request.text.startswith(u'\ufeff'):
         request.encoding = 'utf-8-sig'
-    return request.json()
+    try:
+        return request.json()
+    except:
+        # Maybe an older API version which did not return correct JSON
+        return {}
 
 
 def fixBOM(request):
@@ -1821,7 +1825,7 @@ def resumePreviousDump(config={}, other={}):
             if lasttitle == '':
                 lasttitle=lasttitles.next()
         except:
-            pass  # probably file does not exists
+            lasttitle = ''  # probably file does not exists
         if lasttitle == '--END--':
             # titles list is complete
             print 'Title list was completed in the previous session'
@@ -1974,7 +1978,6 @@ def saveIndexPHP(config={}, session=None):
         with open('%s/index.html' % (config['path']), 'w') as outfile:
             outfile.write(raw.encode('utf-8'))
 
-
 def saveSiteInfo(config={}, session=None):
     """ Save a file with site info """