MB-35282: Make cbvdiff tolerate nodes with zero active or replica items

Change-Id: Ia0877febb16dda791bcf246620ca116bab1a3dae
Reviewed-on: http://review.couchbase.org/113334
Tested-by: James Harrison <[email protected]>
Reviewed-by: Dave Rigby <[email protected]>

Author: jameseh96

engines/ep/management/cbvdiff

@@ -3,11 +3,10 @@
 import optparse
 import socket
 import sys
-import os
-import subprocess
 
 import mc_bin_client
 
+
 def main():
     parser = optparse.OptionParser(
              usage="usage: %prog ip1:memcachedport1,ip2:memcachedport2",
@@ -85,12 +84,12 @@ def main():
     # ------ Global Stats Collected ----------
     item_count = 0
     for vbid in vbstats:
-        active_count = int(vbstats[vbid]["num_items"]["active"])
-        replica_count = int(vbstats[vbid]["num_items"]["replica"])
+        active_count = int(vbstats[vbid]["num_items"].get("active", 0))
+        replica_count = int(vbstats[vbid]["num_items"].get("replica", 0))
         if active_count != replica_count:
            print("VBucket %d: active count %d != %d replica count \n"
                 % (vbid, active_count, replica_count))
-        item_count += int(vbstats[vbid]["num_items"]["active"])
+        item_count += int(vbstats[vbid]["num_items"].get("active", 0))
     print("Active item count = %d\n" % item_count)
 
 if __name__ == '__main__':