if not exist docker proxy

Author: Zheng, YuyinX

VCAC-A/Intel_Media_Analytics_Node/scripts/vcad_build.sh

@@ -654,9 +654,13 @@ install_vcad() {
 		fi
 	fi
          #set git proxy
-        git_http_proxy=$HTTP_PROXY
-        git_https_proxy=$HTTPS_PROXY
-
+         if [ ! $HTTP_PROXY ] ; then
+           git_proxy_flag=0
+         else
+           git_proxy_flag=1
+           git_http_proxy=$HTTP_PROXY
+           git_https_proxy=$HTTPS_PROXY
+         fi
 	# generate install script
 	_cd ${BUILD_DIR}
 	cat > install_package_in_image.sh <<EOF 
@@ -666,8 +670,10 @@ export LC_ALL=C
 apt update && apt install -y libjson-c3 libboost-program-options1.65-dev libboost-thread1.65 libboost-filesystem1.65 libusb-dev cron python3-pip build-essential curl wget libssl-dev ca-certificates git libboost-all-dev gcc-multilib g++-multilib libgtk2.0-dev pkg-config libpng-dev libcairo2-dev libpango1.0-dev libglib2.0-dev libusb-1.0-0-dev i2c-tools libgstreamer-plugins-base1.0-dev libavformat-dev libavcodec-dev libswscale-dev libgstreamer1.0-dev  libusb-1.0-0-dev i2c-tools libjson-c-dev usbutils ocl-icd-libopencl*  ocl-icd-opencl-dev libsm-dev libxrender-dev libavfilter-dev tzdata cpio libgtk-3-dev
 
 rm -rf /usr/bin/python && cd /usr/bin && ln -s python3.6 python
-git config --global http.proxy ${git_http_proxy}
-git config --global https.proxy ${git_https_proxy}
+if [ ${git_proxy_flag} == 1 ];then
+   git config --global http.proxy ${git_http_proxy}
+   git config --global https.proxy ${git_https_proxy}
+fi
 cd /root/package
 pip3 install numpy-*.whl
 pip3 install opencv_python-*.whl