Bug report via internal suggestion.

[Walamazoo]

The following message displayed while looking though cards. It occurred when clicking on a card with the Mainframe DFC (M15 DFCs) style.

   [Window Title]
    Error
    
    [Main Instruction]
    An internal error occured:
    
    [Content]
    invalid vector subscript
    Please save your work (use 'save as' to so you don't overwrite things)
    and restart Magic Set Editor.
    
    You should leave a bug report on https://github.com/twanvl/MagicSetEditor2/issues/
    Press Ctrl+C to copy this message to the clipboard.
    
    Call stack:
    [00] 00007FF769A84647
    [01] 00007FF769EF7DF0
    [02] 00007FF769EA11D0
    [03] 00007FF769EA00A6
    [04] RtlCaptureContext2                      
    [05] 00007FF769A24EAC
    [06] 00007FF769C75C58
    [07] 00007FF769CA78AF
    [08] 00007FF769CA752F
    [09] 00007FF769CA86FC
    [10] 00007FF769CA77DA
    [11] 00007FF769CA82EA
    [12] 00007FF769AE8544
    [13] 00007FF769AEE37F
    [14] 00007FF769AF0F58
    [15] 00007FF769AF785F
    [16] CallWindowProcW                         
    [17] DispatchMessageW                        
    [18] IsDialogMessageW                        
    [19] 00007FF769AEFFEF
    [20] 00007FF769BF466F
    
    [OK]