Allow translated messages that have no matching original message

pkg/intl/lib/extract_messages.dart

Index: pkg/intl/lib/extract_messages.dart
diff --git a/pkg/intl/lib/extract_messages.dart b/pkg/intl/lib/extract_messages.dart
index fc8bd0999cec31534aef745d135ef360a0ef7c07..1ca9e13d02ba72a04d1d99eec5623d3f5d28bb28 100755
--- a/pkg/intl/lib/extract_messages.dart
+++ b/pkg/intl/lib/extract_messages.dart
@@ -201,9 +201,9 @@ class MessageFindingVisitor extends GeneralizingASTVisitor {
 
   void reportErrorLocation(ASTNode node) {
     if (origin != null) print("    from $origin");
-    LineInfo info = root.lineInfo;
+    var info = root.lineInfo;
     if (info != null) {
-      LineInfo_Location line = info.getLocation(node.offset);
+      var line = info.getLocation(node.offset);
       print("    line: ${line.lineNumber}, column: ${line.columnNumber}");
     }
   }