Fixed null pointer on swift folder path separator

Author: ferrys

doc/sphinx-guides/source/installation/config.rst

@@ -222,11 +222,7 @@ Then run the create command:
 
 ``./asadmin $ASADMIN_OPTS create-jvm-options "\-Ddataverse.files.storage-driver-id=swift"``
 
-You also have the option to set a custom container name separator. It is initialized to ``_``, so you must first run the delete command:
-
-``./asadmin $ASADMIN_OPTS delete-jvm-options "\-Ddataverse.files.swift-folder-path-separator=_"``
-
-And then run the create command:
+You also have the option to set a custom container name separator. It is initialized to ``_``, but you can change it by running the create command:
 
 ``./asadmin $ASADMIN_OPTS create-jvm-options "\-Ddataverse.files.swift-folder-path-separator=-"``
 

src/main/java/edu/harvard/iq/dataverse/dataaccess/SwiftAccessIO.java

@@ -666,6 +666,9 @@ private String getSwiftFileURI(StoredObject fileObject) throws IOException {
 
      public String getSwiftContainerName() {
         String swiftFolderPathSeparator = System.getProperty("dataverse.files.swift-folder-path-separator");
+        if (swiftFolderPathSeparator == null) {
+            swiftFolderPathSeparator = "_";
+        }
         String authorityNoSlashes = this.getDataFile().getOwner().getAuthority().replace(this.getDataFile().getOwner().getDoiSeparator(), swiftFolderPathSeparator);
         String containerName = this.getDataFile().getOwner().getProtocol() + swiftFolderPathSeparator +
             authorityNoSlashes.replace(".", swiftFolderPathSeparator) +