crash when trying to add image files to image folder

Please read http://code.google.com/p/sigil/wiki/ReportingIssues for
information about submitting a good bug report.

What steps will reproduce the problem?
1. Right-clicking on image folder to add a file 
2.
3.
...

What is the expected output? What do you see instead?
Program crashes and shuts down

What version of the product are you using? On what operating system?
0.7.2 on Mac 10.8.4

Please provide any additional information below. If your source file is
required to fully understand the problem, please attach it to this issue.
Read the ReportingIssues wiki page before
submitting!

Process:         Sigil [1260]
Path:            /Applications/Sigil.app/Contents/MacOS/Sigil
Identifier:      com.sigil-ebook.Sigil.app
Version:         0.7.2 (0.7.2)
Code Type:       X86-64 (Native)
Parent Process:  launchd [146]
User ID:         502

Date/Time:       2013-07-06 14:38:26.312 -0700
OS Version:      Mac OS X 10.8.4 (12E55)
Report Version:  10
Sleep/Wake UUID: 162989F5-87B0-4DBF-A3A5-D39F412EC70D

Interval Since Last Report:          32665 sec
Crashes Since Last Report:           1
Per-App Interval Since Last Report:  30701 sec
Per-App Crashes Since Last Report:   1
Anonymous UUID:                      59B3EFAB-CAA3-22BD-BE81-151736C73ACE

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000

Application Specific Information:
*** Terminating app due to uncaught exception of class 'nil'
abort() called
terminate called throwing an exception

Original issue reported on code.google.com by frmart...@gmail.com on 6 Jul 2013 at 10:01

oasegips / sigil

crash when trying to add image files to image folder #2307