pgm: Handle exceptions in RevParse command

This avoids we show a stacktrace on the console by default when this
type of exception is thrown during the run method is executed.

Change-Id: Iae510d8c6af9acd587822a28ad48eab0b2a96ccd
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/RevParse.java

@@ -45,6 +45,7 @@
 
 package org.eclipse.jgit.pgm;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -69,12 +70,13 @@ class RevParse extends TextBuiltin {
 
 	/** {@inheritDoc} */
 	@Override
-	protected void run() throws Exception {
+	protected void run() {
+		try {
 			if (all) {
 				for (Ref r : db.getRefDatabase().getRefs()) {
 					ObjectId objectId = r.getObjectId();
-				// getRefs skips dangling symrefs, so objectId should never be
+					// getRefs skips dangling symrefs, so objectId should never
-				// null.
+					// be null.
 					if (objectId == null) {
 						throw new NullPointerException();
 					}
@@ -91,5 +93,8 @@ class RevParse extends TextBuiltin {
 					outw.println(o.name());
 				}
 			}
+		} catch (IOException | CmdLineException e) {
+			throw die(e.getMessage(), e);
+		}
 	}
 }