Editing time doesn't work if it's the only entry in a day

[crittermike]

Reported by @mike-potter

Edit an entry that is the only single time entry for that day, then update the text, then click Add. Instead of adding it just clears out the “what are you working on” field. Note that editing works fine if it's not the only time entry for that day.

[crittermike]

Fix pushed, will be included in the next build.