This patch adds two error conditions: 1) if one path in PACKAGES_PATH doesn't exist. 2) if the space exists in the PACKAGES_PATH. In V2, highlight one path in PACKAGES_PATH env doesn't exist. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> Reviewed by: Andrew Fish <afish@apple.com>