Zero terminate script names generated by js2c.

tools/js2c.py

Index: tools/js2c.py
diff --git a/tools/js2c.py b/tools/js2c.py
index 9492b0030c0dbf56f91f78208230e3aa89db300e..49186e846022e00f417628203ce488313e4c637f 100644
--- a/tools/js2c.py
+++ b/tools/js2c.py
@@ -259,7 +259,7 @@ namespace internal {
   template <>
   Vector<const char> NativesCollection<%(type)s>::GetScriptName(int index) {
 %(get_script_name_cases)s\
-    return Vector<const char>("", 0);
+    return Vector<const char>("", 1);
   }
 
   template <>
@@ -364,7 +364,7 @@ def JS2C(source, target, env):
         })
     get_script_name_cases.append(GET_SCRIPT_NAME_CASE % {
         'name': native_name,
-        'length': len(native_name),
+        'length': len(native_name) + 1,
         'i': i
         })
     i = i + 1