1 Followup for bug#9011  - New value after value mapping can't be 0.
Squashed commit of the following:

commit 712dcc7977bf28801613c41d703288b291635aaa
Merge: e7e3e49 8355e19
Author: Carlos Rodriguez <carlos.rodriguez@otrs.com>
Date:   Thu Feb 13 03:50:14 2014 -0600

    Merge branch 'rel-3_3_bug#9011' of github.com:s7design/otrs into s7design-rel-3_3_bug#9011

commit 8355e19e8b3ae2079942b006b7c123800373cf66
Author: s7design <otrs@s7designcreative.com>
Date:   Mon Feb 3 08:14:08 2014 +0100

    Change operator || to // because this operator will check if the variable is defined or nor

commit 1d420609bcad8fc1d18106b66e0f126192340b5f
Author: s7design <otrs@s7designcreative.com>
Date:   Fri Jan 31 17:59:20 2014 +0100

    [Bug 9011]

    New value after value mapping can't be 0.
Added browser check for IE10 in compatibility mode.
Fixed: OTRS Portal - Overview of registered systems (bug#10248).
Added feature to download report data shown in dashboard stats as CSV and PDF.
Fixed: Graph/Chart generation selects slice/background color identical to text color (bug#6323).
Squashed commit of the following:

commit 16d27c25b23c2c0ba0e3f81a1a632750b42355b1
Author: s7design <otrs@s7designcreative.com>
Date:   Tue Feb 4 09:51:05 2014 +0100

    [Bug 6323] Graph/Chart generation selects slice/background color identical to text color

    Deleted black color  for the graphs (Stats::Graph::dclrs) in config XML file, and also deleted black color from list of default color in Stats.pm.

    Note:
    This only define default list of color, but if user want, he can define black colors for the graphs.