fix: SiteDirector - fix CVMFS_locations string value

Author: atsareg

src/DIRAC/WorkloadManagementSystem/Agent/SiteDirector.py

@@ -1035,7 +1035,7 @@ def _getPilotOptions(self, queue, **kwargs):
         # Preinstalled environment or list of CVMFS locations defined ?
         preinstalledEnv = opsHelper.getValue("Pilot/PreinstalledEnv", "")
         preinstalledEnvPrefix = opsHelper.getValue("Pilot/PreinstalledEnvPrefix", "")
-        CVMFS_locations = opsHelper.getValue("Pilot/CVMFS_locations", "")
+        CVMFS_locations = ",".join(opsHelper.getValue("Pilot/CVMFS_locations", []))
         if preinstalledEnv:
             pilotOptions.append(f"--preinstalledEnv={preinstalledEnv}")
         elif preinstalledEnvPrefix: