Task #10368: fabric is not required during build, but during runtime. So try...

Task #10368: fabric is not required during build, but during runtime. So try to import, and explain what to do when fabric is not installed. The build-host is also not necessarily the run-host

MAC/Services/src/CMakeLists.txt

@@ -2,7 +2,7 @@
 
 include(FindPythonModule)
 
-find_python_module(fabric REQUIRED)
+find_python_module(fabric)
 
 lofar_add_bin_scripts(
   pipelinecontrol

MAC/Services/src/ObservationControl2.py

@@ -19,10 +19,16 @@
 # with the LOFAR software suite. If not, see <http://www.gnu.org/licenses/>.
 import os
 import logging
-from fabric import tasks
 from optparse import OptionParser
 
-from fabric.api import env, run
+try:
+    from fabric import tasks
+    from fabric.api import env, run
+except ImportError as e:
+    print str(e)
+    print 'Please install python package fabric: sudo apt-get install fabric'
+    exit(1)
+
 from lofar.messaging import Service
 from lofar.messaging import setQpidLogLevel
 from lofar.common.util import waitForInterrupt