Fix for segfault on disabling the NateOn account

[matt]

I've made 3 changes to the source of the NateOn? plugin.

1. I have removed one segfault due to a null in nateon.c. The fix is essentially checking if the variable is null, and if it is; skiping the crashing code. To reproduce the fault: a. open a NateOn? conversation. b. disable the nateon account associated with the conversation. c. segfault.

2. Altered the "Signed in from elsewhere" warning in session.c. Originally it used a generic error warning, now it uses the specific "Signed in from elsewhere" type error, so Pidgin handles them together (eg I sign in on MSN and NateOn? on another computer, the 2 warnings are joined into one signed in elsewhere warning). Please see the screen-shot for a better explanation.

3. Memo Dialogue The "Send Memo" dialogue is untitled and looks untidy in the task-bar. I've added in an English title in nateon.c. It needs a Korean translation adding in too in the ko.po file.

I know very little about C, so any help or advice is welcome.

[matt]

Patch file for my changes

[matt]

Screenshot for change 32