Fixed blanking of values for missing lang keys.

Closes #37.

Author: coderifous

dist/jquery.localize.js

@@ -98,7 +98,9 @@ http://keith-wood.name/localisation.html
         key = elem.data("localize");
         key || (key = elem.attr("rel").match(/localize\[(.*?)\]/)[1]);
         value = valueForKey(key, data);
-        return localizeElement(elem, key, value);
+        if (value != null) {
+          return localizeElement(elem, key, value);
+        }
       });
     };
     localizeElement = function(elem, key, value) {

dist/jquery.localize.min.js

@@ -78,7 +78,7 @@ do ($ = jQuery) ->
         key   = elem.data("localize")
         key ||= elem.attr("rel").match(/localize\[(.*?)\]/)[1]
         value = valueForKey(key, data)
-        localizeElement(elem, key, value)
+        localizeElement(elem, key, value) if value?
 
     localizeElement = (elem, key, value) ->
       if          elem.is('input')       then localizeInputElement(elem, key, value)

src/jquery.localize.coffee

@@ -0,0 +1,2 @@
+{
+}

test/lang/test2-ja.json

@@ -49,6 +49,12 @@ do ($ = jQuery) ->
     t.localize("test", @testOpts)
     equal t.val(), "input success"
 
+  test "input tag value after second localization without key", ->
+    t = localizableTagWithRel("input", "test.input", val: "input fail")
+    t.localize("test", @testOpts)
+    t.localize("test2", @testOpts)
+    equal t.val(), "input success"
+
   test "input tag placeholder substitution", ->
     t = localizableTagWithRel("input", "test.input", placeholder: "placeholder fail")
     t.localize("test", @testOpts)

test/localize_test.coffee

@@ -75,6 +75,15 @@
     t.localize("test", this.testOpts);
     return equal(t.val(), "input success");
   });
+  test("input tag value after second localization without key", function() {
+    var t;
+    t = localizableTagWithRel("input", "test.input", {
+      val: "input fail"
+    });
+    t.localize("test", this.testOpts);
+    t.localize("test2", this.testOpts);
+    return equal(t.val(), "input success");
+  });
   test("input tag placeholder substitution", function() {
     var t;
     t = localizableTagWithRel("input", "test.input", {