[patch] edit a dive + cancel = absolute 0 for air temperature

[Patrick Valsecchi]

Hi,

Fixing this ticket: http://trac.hohndel.org/ticket/207

Patch attached

CU
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0001-Fix-edit-cancel-absolute-zero.patch
Type: text/x-patch
Size: 1055 bytes
Desc: not available
URL: <http://lists.hohndel.org/pipermail/subsurface/attachments/20131008/74d8e7e5/attachment.bin>