[1.0.1] IDE: crashes when using open on a path not ending with .sikuli --- workaround --- fixed with 1.1.0-Beta2

[Parn Yin]

----- workaround
click through the file structure in the open dialog to get to the wanted folder
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[Steps to Reproduce]
Suppose the Sikuli script is under "C:\ProjectSikuli\Script\test.sikuli" and now I have a Windows Explorer opened with "C:\ProjectSikuli\Script" folder.
(1) Open Sikuli IDE.
(2) Select "File" - "Open" from the menu bar. The "Open a Sikuli Source folder" window is displayed.
(3) Because the displayed path is not I want, to find the Sikuli script quicker, I copy "C:\ProjectSikuli\Script" from the address bar of Windows Explorer to the clipboard.
(4) Paste it to the "Open a Sikuli Source folder" window's "Folder name" field and click the "Open" button.

[Actual Result]
Sikuli crashes, Although with no error, it closes itself, which is not I want.

[Expected Result]
Sikuli finds "C:\ProjectSikuli\Script" is not a Sikuli script folder so that it should open it just as Windows Exploer do, not suicide.