Avoid upload of package if build fails

Failed to transfer Could not find metadata org.nuxeo.marketplace.signature:parent:2.5.3-SNAPSHOT/maven-metadata.xml in internal-snapshots-mirror (http://mavenin.nuxeo.com/nexus/content/groups/internal-snapshots)
Failed to transfer Could not find artifact org.nuxeo.marketplace.signature:parent:pom:2.5.3-SNAPSHOT in internal-snapshots-mirror (http://mavenin.nuxeo.com/nexus/content/groups/internal-snapshots)
Downloaded artifact http://maven.nuxeo.org/nexus/content/groups/public-snapshot/org/nuxeo/nuxeo-addons-core-parent/9.1-SNAPSHOT/maven-metadata.xml
Downloaded artifact http://mavenin.nuxeo.com/nexus/content/groups/internal-snapshots/org/nuxeo/nuxeo-addons-core-parent/9.1-SNAPSHOT/maven-metadata.xml
[addons_FT_nuxeo-signature-master] $ /bin/bash -xe /tmp/hudson8119262833452146439.sh
+ for file in 'marketplace/target/marketplace-*-SNAPSHOT.zip'
+ [[ -e marketplace/target/marketplace-2.6.0-SNAPSHOT.zip ]]
++ ls marketplace/target/marketplace-2.6.0-SNAPSHOT.zip
+ curl -i -n -F package=@marketplace/target/marketplace-2.6.0-SNAPSHOT.zip 'https://connect.nuxeo.com/nuxeo/site/marketplace/upload?batch=true'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 1117k    0     0  100 1117k      0   934k  0:00:01  0:00:01 --:--:--  935k
100 1117k    0     0  100 1117k      0   508k  0:00:02  0:00:02 --:--:--  509k
100 1117k    0     0  100 1117k      0   349k  0:00:03  0:00:03 --:--:--  349k
100 1117k    0     0  100 1117k      0   324k  0:00:03  0:00:03 --:--:--  324k
HTTP/1.1 100 Continue

HTTP/1.1 200 OK
Content-Type: text/html;charset=UTF-8
Date: Fri, 02 Dec 2016 09:04:26 GMT
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=68F34D088B029E1ED02E1F05B718A8FC.test1; Path=/nuxeo/; HttpOnly
X-UA-Compatible: IE=10; IE=11
Content-Length: 0
Connection: keep-alive