fixed minor findbugs warning

src/main/java/it/unibz/inf/isochrone/config/ConfigDataset.java

@@ -17,7 +17,6 @@ import it.unibz.inf.isochrone.util.ResourceHelper;
 
 import java.io.File;
 import java.io.IOException;
-import java.io.InputStream;
 import java.net.URL;
 import java.text.DateFormat;
 import java.text.ParseException;
@@ -369,8 +368,6 @@ public class ConfigDataset {
 		final Pattern dsConfigPattern = Pattern.compile(DS_CONFIG_PATTERN);
 
 		URL r = null;
-		InputStream r2 = null;
-
 		final Collection<String> resources = new ArrayList<>();
 		try {
 			// find resources on disk and add to available ones
@@ -397,14 +394,6 @@ public class ConfigDataset {
 			}
 		} catch (IOException e) {
 			LOGGER.warn("Datasets could not be read. There might be no configured datasets available!");
-		} finally {
-			if (r2 != null) {
-				try {
-					r2.close();
-				} catch (IOException e) {
-					LOGGER.debug("Could not close input stream after searching for config files in classpath");
-				}
-			}
 		}
 
 		if (resources.size() <= 0) {