bug_1461221.patch

# HG changeset patch
# User Gregory Szorc <gps@mozilla.com>
# Date 1526410966 25200
# Node ID e4ce7b97291627f2186dc23be0dadd3c56dfe938
# Parent  f288a2c9c4390898a17ad9f964218b52b87d8028
Bug 1461221 - Account for psutil.disk_io_counters() returning None; r=mshal

Apparently it can do this.

MozReview-Commit-ID: 6gMTGtcRAw6

diff --git a/testing/mozbase/mozsystemmonitor/mozsystemmonitor/resourcemonitor.py b/testing/mozbase/mozsystemmonitor/mozsystemmonitor/resourcemonitor.py
--- a/testing/mozbase/mozsystemmonitor/mozsystemmonitor/resourcemonitor.py
+++ b/testing/mozbase/mozsystemmonitor/mozsystemmonitor/resourcemonitor.py
@@ -60,16 +60,19 @@ except Exception:
         psutil = None
 
     have_psutil = False
 
 
 def get_disk_io_counters():
     try:
         io_counters = psutil.disk_io_counters()
+
+        if io_counters is None:
+            return PsutilStub().disk_io_counters()
     except RuntimeError:
         io_counters = PsutilStub().disk_io_counters()
 
     return io_counters
 
 
 def _collect(pipe, poll_interval):
     """Collects system metrics.