(Bug 5221) A few more uninitialized values used as strings.

Use of uninitialized value $selwhere in concatenation (.) or string at
/dreamhack/home/8103-alierak/dw/cgi-bin/LJ/Memories.pm line 456.

Use of uninitialized value $extrawhere in concatenation (.) or string at
/dreamhack/home/8103-alierak/dw/cgi-bin/LJ/Memories.pm line 456.

Use of uninitialized value in string eq at
/dreamhack/home/8103-alierak/dw/cgi-bin/LJ/Talk.pm line 1032.