Merged in maxim_productengine/viewer-neko_maint2 (pull request #707)

SL-10043 FIXED Viewer crashes when double-clicking 'For sale' parcel icon on World map in some cases

Approved-by: Andrey Lihatskiy <andreylproductengine@lindenlab.com>
Approved-by: Andrey Kleshchev <andreykproductengine@lindenlab.com>