create-appimage.sh: silence tput err msgs

tput is just a pretty-printer, suppress the errs like `tput: unknown
terminal "unknown"` in CI (not relevant at all, just to make it clear)

Author: MartinPulec

data/scripts/Linux-AppImage/create-appimage.sh

@@ -22,10 +22,10 @@ umask 022
 # soft fail - fail in CI, otherwise continue
 handle_error() {
         red=1
-        tput setaf $red || true
-        tput bold || true
+        tput setaf $red 2>/dev/null || true
+        tput bold 2>/dev/null || true
         echo "$1" >&2
-        tput sgr0 || true
+        tput sgr0 2>/dev/null || true
         if [ -n "${GITHUB_REPOSITORY:-}" ]; then
                 exit 2
         fi