not so nice error message if there is no spec file

[tpokorra]

[00297] Warning: Permanently added '10.0.3.33' (RSA) to the list of known hosts.
[00297] Changing to: /home/upload/dbdoc
[00297] sftp> put ../dbdoc.tar.gz
[00297] Uploading ../dbdoc.tar.gz to /home/upload/dbdoc/dbdoc.tar.gz
[00297] 0
 * Executing 'sed -e 's/%{release}/0/g' lbs-openpetra/dbdoc/dbdoc.spec > /tmp/dbdoc.spec' in build01.lbs.solidcharity.com...
[00297] now running: ssh -f -o "StrictHostKeyChecking no" -o Port=2005 -i /var/lib/lbs/ssh/container_rsa build01.lbs.solidcharity.com "export LANG=C; sed -e 's/%{release}/0/g' lbs-openpetra/dbdoc/dbdoc.spec > /tmp/dbdoc.spec 2>&1 && echo \$?"
 * Executing 'yum-builddep -y /tmp/dbdoc.spec' in build01.lbs.solidcharity.com...
[00297] now running: ssh -f -o "StrictHostKeyChecking no" -o Port=2005 -i /var/lib/lbs/ssh/container_rsa build01.lbs.solidcharity.com "export LANG=C; yum-builddep -y /tmp/dbdoc.spec 2>&1 && echo \$?"
[00298] Loaded plugins: fastestmirror
[00298] Enabling epel-source repository
[00298] Loading mirror speeds from cached hostfile
10.0.3.1 - - [26/Feb/2015 21:21:48] "GET /livelog/tpokorra/openpetra/dbdoc/master/centos/6/amd64 HTTP/1.0" 200 6179
10.0.3.1 - - [26/Feb/2015 21:21:48] "GET /css/main.css HTTP/1.0" 304 0
10.0.3.1 - - [26/Feb/2015 21:21:50] "GET /livelog/tpokorra/openpetra/dbdoc/master/centos/6/amd64 HTTP/1.0" 200 6179
10.0.3.1 - - [26/Feb/2015 21:21:51] "GET /css/main.css HTTP/1.0" 304 0
[00302]  * base: mirror.skylink-datacenter.de
[00302]  * epel: mirror.de.leaseweb.net
[00302]  * epel-source: mirror.de.leaseweb.net
[00302]  * extras: mirror.netcologne.de
[00302]  * updates: mirror.de.leaseweb.net
10.0.3.1 - - [26/Feb/2015 21:21:53] "GET /livelog/tpokorra/openpetra/dbdoc/master/centos/6/amd64 HTTP/1.0" 200 6179
10.0.3.1 - - [26/Feb/2015 21:21:53] "GET /css/main.css HTTP/1.0" 304 0
[00303] error: line 1: Unknown tag: sed: can't read lbs-openpetra/dbdoc/dbdoc.spec: No such file or directory
[00303] Bad spec: /tmp/dbdoc.spec
[00303] No uninstalled build requires