[Bugs] #1435 UNSP: Do no use random color if metadata color is not valid

[Sugar Labs Bugs]

#1435: Do no use random color if metadata color is not valid
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    Reporter:  alsroot                    |          Owner:  erikos                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit              |        Version:  0.85.x                     
    Severity:  Unspecified                |       Keywords:  r?                         
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 Using random color for entries that are not valid could be confusing:
 * random colors look like valid colors
 * random colors have been changed on every update(for the same Journal
 entry for example)

 So, using grey colors can signalize that entry is not valid.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1435>
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