Issue #473: Error - Tape 'Preferences' cause loss of focus (dismine/valentina)

New issue 473: Error - Tape ‘Preferences’ cause loss of focus https://bitbucket.org/valentinateam/valentina/issues/473/error-tape-preferences-cause-loss-of-focus

Susan Spencer:

In develop branch, Ubuntu 14.04 64 bit In Tape: Enable Measurement diagram select ‘Preferences’ select Patternmaking system click ‘Apply’

Causes loss of focus Question mark appears in area for measurement diagram