Prevent building for Apple platforms if no `.icns` file is present.

build.sh

@@ -42,8 +42,6 @@ for PLAT in "${TRGT[@]}"; do
 
     URL="$(< "${EUF}")"
 
-    mkdir -pv "${FQP}/${APP}"
-
     EXE=(nativefier --platform "${PLAT}" --arch ${ARCH} --honest --disable-context-menu --disable-dev-tools --name "${APP}")
 
     case "${PLAT}" in
@@ -59,6 +57,9 @@ for PLAT in "${TRGT[@]}"; do
         ;;
     esac
 
+   [ "${PLAT}" = "darwin" -o "${PLAT}" = "mas" ] && [ ! -f "${EIF}" ] && \
+      echo "  -> $(tput bold)$(tput setaf 5)Apple platforms require an .icns file$(tput sgr0)" && continue
+
     EIF="${FQP}/injects/${APP}.css"
     [ -L "${EIF}" ] && EIF="$(readlink -f "${EIF}")"
     [ -f "${EIF}" ] && EXE+=(--inject "${EIF}")
@@ -69,6 +70,7 @@ for PLAT in "${TRGT[@]}"; do
 
     EXE+=("${URL}")
 
+    mkdir -pv "${FQP}/${APP}"
     cd "${FQP}/${APP}"
     echo "${EXE[@]}"
     ${EXE[@]}