Merge "Optionally check for diskimages on nodepool log generation tool"

tools/nodepool_log_config.py

@@ -129,6 +129,7 @@ def _get_providers_and_images(config_file):
     logging.debug("Added %d providers & images" % len(ret))
 
     # diskimages have a special provider
+    if 'diskimages' in config:
         for diskimage in config['diskimages']:
             ret.append(('dib', diskimage['name']))