Also check if organ or term file is empty

Null-check is not enough for a string type and does not cover the case
where the entry is set to empty in the configuration.

Author: arteymix

src/main/java/ubc/pavlab/rdp/services/GOServiceImpl.java

@@ -96,7 +96,7 @@ public void updateGoTerms() {
 
         log.info( MessageFormat.format( "Loading GO terms from: {0}.", cacheSettings.getTermFile() ) );
 
-        if ( cacheSettings.getTermFile() == null ) {
+        if ( cacheSettings.getTermFile() == null || cacheSettings.getTermFile().isEmpty() ) {
             log.warn( "No term file is defined, skipping update of GO terms." );
             return;
         }

src/main/java/ubc/pavlab/rdp/services/OrganInfoServiceImpl.java

@@ -52,7 +52,7 @@ public Collection<OrganInfo> findByActiveTrueOrderByOrdering() {
     public void updateOrganInfos() {
         try {
             Resource organFile = null;
-            if ( applicationSettings.getCache().getOrganFile() != null ) {
+            if ( applicationSettings.getCache().getOrganFile() != null || applicationSettings.getCache().getOrganFile().isEmpty() ) {
                 organFile = resourceLoader.getResource( applicationSettings.getCache().getOrganFile() );
             }
             if ( organFile == null ) {