[orca] Fix for bug 687527 - Handle applications returning 0 in minimalIncrement for Value

[Joanmarie Diggs <joanied src gnome org>]

commit a958d7eca181a42e68ed4b8c3ac96e0922eb3c94
Author: Frederik Gladhorn <gladhorn kde org>
Date:   Sat Nov 3 14:12:47 2012 -0400

    Fix for bug 687527 - Handle applications returning 0 in minimalIncrement for Value

 src/orca/script_utilities.py |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)
---
diff --git a/src/orca/script_utilities.py b/src/orca/script_utilities.py
index 0054d47..b4ed4ab 100644
--- a/src/orca/script_utilities.py
+++ b/src/orca/script_utilities.py
@@ -2913,10 +2913,15 @@ class Utilities:
             debug.println(debug.LEVEL_FINEST, "VALUE WARNING: " \
                           "Error accessing minimumIncrement for %s" % obj)
 
-        try:
-            decimalPlaces = math.ceil(max(0, -math.log10(minIncrement)))
-        except ValueError:
-            return ""
+        if minIncrement != 0.0:
+            try:
+                decimalPlaces = math.ceil(max(0, -math.log10(minIncrement)))
+            except ValueError:
+                debug.println(debug.LEVEL_FINEST, "VALUE WARNING: " \
+                    "Error calculating decimal places for %s" % obj)
+                return ""
+        else:
+            decimalPlaces = 0
 
         formatter = "%%.%df" % decimalPlaces
         return formatter % currentValue