this fixes a segfault when the client emits .set_hints but it's not mapped
Fixes: 72a7d78a1a7926a207539eb50f44b2e1eb089d49
I2HHGMMODDDBJQXDPTRC6K47ZSMMGLF3XMSRRSMH34OLI22HDEGQC
GA2NZJ5L2HEU4DYZNLNCUIBE7SCI7UV7T3BY5WMCDTLCS53Q7SEAC
7RQF3NQLQNMISMXEQSJNXI4JQZFB5RJPFMRI4FTN67QQCDYVUUIAC
7B74AT3BXYB7PVW4F6SGQNPMHOU5TEV5TZ54CG6VSQI46XSEKWXQC
YUZIWFDRC7OPGBBLI7Z77RMT3PTXEV2JAHQXKANK74WN25434GUQC
client_set_border_color(c, urgentcolor);
if (c->isurgent && client_is_mapped(c)) client_set_border_color(c, urgentcolor);
if (c->isurgent && client_is_mapped(c))