draw.py: tolerate total_time == 0

Sometimes I get all 0s in sample.cpu_sample.sample_value,
and pybootchartgui crashes with division by zero.

Signed-off-by: Armin Kuster <akuster808@gmail.com>

diff --git a/scripts/pybootchartgui/pybootchartgui/draw.py b/scripts/pybootchartgui/pybootchartgui/draw.py
index 201ce4577fcba4c2dd476135fc48824d6748ee88..b21690d61dd51fa90afa7213fc14873f1a250e95 100644 (file)
--- a/scripts/pybootchartgui/pybootchartgui/draw.py
+++ b/scripts/pybootchartgui/pybootchartgui/draw.py
@@ -825,7 +825,7 @@ def draw_cuml_graph(ctx, proc_tree, chart_bounds, duration, sec_w, stat_type):
 
        # all the sample times
        times = sorted(time_hash)
-       if len (times) < 2:
+       if len (times) < 2 or total_time == 0:
                print("degenerate boot chart")
                return