fixed logical check in install script

.gitignore

@@ -1 +1,3 @@
 *.*sw*
+bower_components/
+assets/

install.sh

@@ -1,10 +1,12 @@
 #!/bin/bash
 
+set -e
+set -u
 # git clone git@git.daplie.com:OAuth3/org.oauth3.git /srv/walnut/packages/pages/org.oauth3
 
 mkdir -p assets
-if [ -d ./assets/org.oauth3 ]; then
-	git clone git@git.daplie.com:Daplie/oauth3.js.git ./assets/org.oauth3
+if ! [ -d ./assets/org.oauth3 ]; then
+  git clone git@git.daplie.com:Daplie/oauth3.js.git ./assets/org.oauth3
 fi
 pushd ./assets/org.oauth3
   git checkout v1