Make safer way to handle json reader

In order to handle the higher version of BigDataServer, it should skip the String value with reader.nextString() call for default.

src/main/java/bdv/ij/BigDataBrowserPlugIn.java

@@ -101,6 +101,8 @@ public class BigDataBrowserPlugIn implements PlugIn
 					thumbnailUrl = reader.nextString();
 				else if ( name.equals( "datasetUrl" ) )
 					datasetUrl = reader.nextString();
+				else
+					reader.nextString();
 			}
 
 			if ( id != null )