add error catching on write

Author: oliver-moran

index.js

@@ -1776,6 +1776,8 @@ Jimp.prototype.write = function (path, cb) {
         stream.on("open", function(fh) {
             stream.write(buffer);
             stream.end();
+        }).on("error", function(err) {
+            return throwError.call(that, err, cb);
         });
         stream.on("finish", function(fh) {
             return cb.call(that, null, that);