Avoid double-colon in InvalidObjectIdException description

The invalidId message in JGitText and the asAscii bad id both contain a
colon, so the resulting message would say

	Invalid id: : a78987c98798ufa

Fix it by keeping the colon in the translated message and not adding
another colon programmatically.

Noticed by code inspection.

Change-Id: I13972eebde27a4128828e6c64517666f0ba6288b
Signed-off-by: Jonathan Nieder <jrn@google.com>

org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties

@@ -325,6 +325,7 @@ invalidEncryption=Invalid encryption
 invalidGitdirRef = Invalid .git reference in file ''{0}''
 invalidGitType=invalid git type: {0}
 invalidId=Invalid id: {0}
+invalidId0=Invalid id
 invalidIdLength=Invalid id length {0}; should be {1}
 invalidIgnoreParamSubmodule=Found invalid ignore param for submodule {0}.
 invalidIntegerValue=Invalid integer value: {0}.{1}={2}

org.eclipse.jgit/src/org/eclipse/jgit/errors/InvalidObjectIdException.java

@@ -45,7 +45,8 @@
 
 package org.eclipse.jgit.errors;
 
-import java.io.UnsupportedEncodingException;
+import static java.nio.charset.StandardCharsets.US_ASCII;
+
 import java.text.MessageFormat;
 
 import org.eclipse.jgit.internal.JGitText;
@@ -64,16 +65,16 @@ public class InvalidObjectIdException extends IllegalArgumentException {
 	 * @param length of the sequence of invalid bytes.
 	 */
 	public InvalidObjectIdException(byte[] bytes, int offset, int length) {
-		super(MessageFormat.format(JGitText.get().invalidId, asAscii(bytes, offset, length)));
+		super(msg(bytes, offset, length));
 	}
 
-	private static String asAscii(byte[] bytes, int offset, int length) {
+	private static String msg(byte[] bytes, int offset, int length) {
 		try {
-			return ": " + new String(bytes, offset, length, "US-ASCII"); //$NON-NLS-1$ //$NON-NLS-2$
-		} catch (UnsupportedEncodingException e2) {
-			return ""; //$NON-NLS-1$
-		} catch (StringIndexOutOfBoundsException e2) {
-			return ""; //$NON-NLS-1$
+			return MessageFormat.format(
+					JGitText.get().invalidId,
+					new String(bytes, offset, length, US_ASCII));
+		} catch (StringIndexOutOfBoundsException e) {
+			return JGitText.get().invalidId0;
 		}
 	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java

@@ -384,6 +384,7 @@ public class JGitText extends TranslationBundle {
 	/***/ public String invalidGitdirRef;
 	/***/ public String invalidGitType;
 	/***/ public String invalidId;
+	/***/ public String invalidId0;
 	/***/ public String invalidIdLength;
 	/***/ public String invalidIgnoreParamSubmodule;
 	/***/ public String invalidIntegerValue;