TrigPSC: Suppress warning when running in partition

`PYTHONSETUPFILE` is not available when running in a partition. Suppress
the warning message.

HLT/Trigger/TrigControl/TrigPSC/TrigPSC/Config.h

 /*
-  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
 /**
@@ -42,8 +42,9 @@ namespace psc {
 
     /**
      * Gets an option in a "safer" way
+     * @param quiet  Print warning if option is not available
      */
-    std::string getOption(const std::string& key) const;
+    std::string getOption(const std::string& key, bool quiet=false) const;
 
     /**
      * Incredibly simple minded way to access this object from python.

HLT/Trigger/TrigControl/TrigPSC/src/Config.cxx

@@ -207,12 +207,14 @@ std::string psc::Config::dumpOptions() const
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-std::string psc::Config::getOption(const std::string& key) const
+std::string psc::Config::getOption(const std::string& key, bool quiet) const
 {
   std::map<std::string, std::string>::const_iterator it = optmap.find(key);
   if (it == optmap.end()) {
-    ERS_PSC_WARNING("Could not find requested option = " << key) ;
-    ERS_DEBUG(1, " " << dumpOptions() ) ;
+    if (!quiet) {
+      ERS_PSC_WARNING("Could not find requested option = " << key);
+      ERS_DEBUG(1, " " << dumpOptions() );
+    }
     return "";
   }
   return it->second;

HLT/Trigger/TrigControl/TrigPSC/src/Psc.cxx

@@ -285,8 +285,8 @@ bool psc::Psc::configure(const ptree& config)
 
     // Do the basic python setup if postcommand or logLevel was changed
     if ( needPython ) {
-      // Normally this is TrigPSC/TrigPSCPythonDbSetup
-      std::string pyBasicFile = m_config->getOption("PYTHONSETUPFILE") ;
+      // only used in athenaHLT, but not in partition running
+      std::string pyBasicFile = m_config->getOption("PYTHONSETUPFILE", /*quiet*/true) ;
       if ( pyBasicFile != "" ) {
         if ( !psc::Utils::pyInclude(pyBasicFile) ) {
           ERS_PSC_ERROR("Basic Python configuration failed.");