[HepMCVisual] #20: Event colelction: check StoreGateKey

[HepMCVisual]

#20: Event colelction: check StoreGateKey
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 Reporter:  sboeser                 |       Owner:  sboeser      
     Type:  defect                  |      Status:  new          
 Priority:  major                   |   Milestone:  First release
Component:  HepMCBrowser algorithm  |     Version:  1.1.X        
 Keywords:                          |  
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 Crash on selection of wrong StoreGate key - embed in try-catch block with
 check for Lookup error

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Ticket URL: <http://projects.hepforge.org/hepmcvisual/trac/ticket/20>
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