Don't attempt to pass empty variables to yarp_install

share/CMakeLists.txt

@@ -2,22 +2,15 @@
 # Author: Juan G Victores and Raul de Santos Rico
 # CopyPolicy: Released under the terms of the GNU GPL v2.0
 
-set(applications)
-set(contexts)
-
 if(ENABLE_launchCanBus)
-    list(APPEND contexts contexts/launchCanBus)
+    yarp_install(DIRECTORY contexts/launchCanBus
+                 DESTINATION ${ROBOTICSLAB-YARP-DEVICES_CONTEXTS_INSTALL_DIR})
 endif()
 
 if(ENABLE_SpaceNavigator)
-    list(APPEND applications applications/yarpmanager/spaceNavigator)
+    yarp_install(DIRECTORY applications/yarpmanager/spaceNavigator
+                 DESTINATION ${ROBOTICSLAB-YARP-DEVICES_APPLICATIONS_INSTALL_DIR}/yarpmanager)
 endif()
 
 yarp_install(FILES applications/yarpmanager/ymanager.ini
              DESTINATION ${ROBOTICSLAB-YARP-DEVICES_APPLICATIONS_INSTALL_DIR}/yarpmanager)
-
-yarp_install(DIRECTORY ${applications}
-             DESTINATION ${ROBOTICSLAB-YARP-DEVICES_APPLICATIONS_INSTALL_DIR}/yarpmanager)
-
-yarp_install(DIRECTORY ${contexts}
-             DESTINATION ${ROBOTICSLAB-YARP-DEVICES_CONTEXTS_INSTALL_DIR})