Fix minor issue with macOS version check

Author: mayankk2308

set-eGPU.sh

@@ -2,7 +2,7 @@
 
 # set-eGPU.sh
 # Author(s): Mayank Kumar (@mac_editor, egpu.io / @mayankk2308, github.com)
-# Version: 2.0.6
+# Version: 2.0.7
 
 # ----- ENVIRONMENT
 
@@ -24,7 +24,7 @@ BIN_CALL=0
 SCRIPT_FILE=""
 
 # Script version
-SCRIPT_MAJOR_VER="2" && SCRIPT_MINOR_VER="0" && SCRIPT_PATCH_VER="6"
+SCRIPT_MAJOR_VER="2" && SCRIPT_MINOR_VER="0" && SCRIPT_PATCH_VER="7"
 SCRIPT_VER="${SCRIPT_MAJOR_VER}.${SCRIPT_MINOR_VER}.${SCRIPT_PATCH_VER}"
 IS_HIGH_SIERRA=0
 PREF_SET_ERROR=0
@@ -165,6 +165,7 @@ check_compatibility() {
   MACOS_LEAP_VER="$(echo -e "${MACOS_VER}" | cut -d '.' -f1)"
   MACOS_MAJOR_VER="$(echo -e "${MACOS_VER}" | cut -d '.' -f2)"
   MACOS_MINOR_VER="$(echo -e "${MACOS_VER}" | cut -d '.' -f3)"
+  [[ -z "${MACOS_MINOR_VER}" ]] && MACOS_MINOR_VER=0
   [[ ${MACOS_LEAP_VER} == "10" && (("${MACOS_MAJOR_VER}" < 13) || ("${MACOS_MAJOR_VER}" == 13 && "${MACOS_MINOR_VER}" < 4)) ]] && echo -e "\nOnly ${BOLD}macOS 10.13.4 or later${NORMAL} compatible.\n" && exit
   (( ${MACOS_LEAP_VER} == "10" && ${MACOS_MAJOR_VER} == "13" )) && IS_HIGH_SIERRA=1
 }