Fail gracefully when we have no data to plot

svn path=/scripts/gc_summary.py; revision=2963

1 files changed, 4 insertions, 1 deletions

diff --git a/scripts/gc_summary.py b/scripts/gc_summary.py
index 694f040f..7a5bd324 100644
--- a/scripts/gc_summary.py
+++ b/scripts/gc_summary.py
@@ -52,6 +52,10 @@ class datapoint(object):
       changed[i.key].add(i.count)
     changed = set(k for k, v in changed.iteritems() if len(v) > 10)
 
+    if not changed:
+      print "print 'No data yet, nothing to plot'"
+      return
+
     print "set xdata time"
     print "set timefmt '%Y-%m-%dT%H:%M:%S'"
     print "set format x '%s'" % cls.timefmt
@@ -80,7 +84,6 @@ class datapoint(object):
     if not cls.outname:
       print "pause mouse any"
 
-
 for filename in sys.argv[1:]:
   for line in open(filename):
     line = line.split()