Return an empty string instead of "NO_INFO" if the current directory is unavailable.

bindings/java/src/org/sleuthkit/datamodel/SleuthkitJNI.java

@@ -298,7 +298,7 @@ public synchronized long commit() throws TskCoreException {
 			 * @return The directory
 			 */
 			public synchronized String currentDirectory() {
-				return tskAutoDbPointer == 0 ? "NO_INFO" : getCurDirNat(tskAutoDbPointer); //NON-NLS
+				return tskAutoDbPointer == 0 ? "" : getCurDirNat(tskAutoDbPointer); //NON-NLS
 			}
 
 			/**