Make <copy> throw an exception if the file to copy doesn't exist.

PR: 1547
Submitted by:	Alan Gates <alang@radik.com>


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269002 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Copy.java

@@ -204,7 +204,10 @@ public class Copy extends Task {
                         Project.MSG_VERBOSE);
                 }
             } else {
-                log("Could not find file " + file.getAbsolutePath() + " to copy.");
+                String message = "Could not find file " 
+                                 + file.getAbsolutePath() + " to copy.";
+                log(message);
+                throw new BuildException(message);
             }
         }