Update xmobar scripts

.bin/sb-pomo

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cat /tmp/pomo
+[ -f "/tmp/pomo" ] && cat /tmp/pomo || echo ""

.bin/sb-project

@@ -1,3 +1,4 @@
 #!/usr/bin/env bash
 
-cat "$HOME/.project"
+# Render contents of $HOME/.project if present
+[ -f "$HOME/.project" ] && cat "$HOME/.project" || echo ""