EnsembleRemove.applyEnsembleConfiguration() Throws StringIndexOutOfBoundsException

In the EnsembleRemove.applyEnsembleConfiguration() method, the following code snippet throws a StringIndexOutOfBoundsException:

String currentDataDir = currentConfig.get("dataDir");

currentDataDir = currentDataDir.substring(0, currentDataDir.lastIndexOf("/"));

In some cases, the currentDataDir String variable's value does not contain the '/' character; therefore a -1 is returned, resulting in a StringIndexOutOfBoundsException.

The code should check for this.