Fix the following error if shrink / enlarge font is used with the help
window.

  Traceback (most recent call last):
    File "tools/perf/scripts/python/exported-sql-viewer.py", line 2791, in 
ShrinkFont
      ShrinkFont(win.view)
  AttributeError: 'HelpWindow' object has no attribute 'view'

Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
 tools/perf/scripts/python/exported-sql-viewer.py | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/tools/perf/scripts/python/exported-sql-viewer.py 
b/tools/perf/scripts/python/exported-sql-viewer.py
index c586abfb2b46..289e8dbd1444 100755
--- a/tools/perf/scripts/python/exported-sql-viewer.py
+++ b/tools/perf/scripts/python/exported-sql-viewer.py
@@ -2770,6 +2770,14 @@ class MainWindow(QMainWindow):
                help_menu = menu.addMenu("&Help")
                help_menu.addAction(CreateAction("&Exported SQL Viewer Help", 
"Helpful information", self.Help, self, QKeySequence.HelpContents))
 
+       def Try(self, fn):
+               win = self.mdi_area.activeSubWindow()
+               if win:
+                       try:
+                               fn(win.view)
+                       except:
+                               pass
+
        def Find(self):
                win = self.mdi_area.activeSubWindow()
                if win:
@@ -2787,12 +2795,10 @@ class MainWindow(QMainWindow):
                                pass
 
        def ShrinkFont(self):
-               win = self.mdi_area.activeSubWindow()
-               ShrinkFont(win.view)
+               self.Try(ShrinkFont)
 
        def EnlargeFont(self):
-               win = self.mdi_area.activeSubWindow()
-               EnlargeFont(win.view)
+               self.Try(EnlargeFont)
 
        def EventMenu(self, events, reports_menu):
                branches_events = 0
-- 
2.17.1

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