fix "java.lang.UnsupportedOperationException" exception

- don't mutate parameters - fails with r.script(Collections.EMPTY_MAP, body) call from https://github.com/grails/grails-core/blob/0479f60/grails-plugin-gsp/src/main/groovy/org/codehaus/groovy/grails/plugins/web/taglib/JavascriptTagLib.groovy#L135

Author: lhotari

grails-app/taglib/org/grails/plugin/resource/ResourceTagLib.groovy

@@ -390,25 +390,31 @@ class ResourceTagLib {
  DispositionsUtils.doneDispositionResources(request, dispositionToRender)
  }
 
- def script = { attributes, body ->
+ def script = { attributesAsParam, body ->
+ def attributes = [:] + attributesAsParam
  attributes.type = "script"
  if (!attributes.disposition) {
  attributes.disposition = DispositionsUtils.DISPOSITION_DEFER
  }
 
- stash(attributes, body)
+ doStash(attributes, body)
  }
 
- def style = { attributes, body ->
+ def style = { attributesAsParam, body ->
+ def attributes = [:] + attributesAsParam
  attributes.type = "style"
  if (!attributes.disposition) {
  attributes.disposition = DispositionsUtils.DISPOSITION_HEAD
  }
 
- stash(attributes, body)
+ doStash(attributes, body)
  }
-
+ 
  def stash = { attributes, body ->
+ doStash(attributes, body)
+ }
+
+ private def doStash(attributes, body) {
  needsResourceLayout()
  StashManager.stashPageFragment(request, (String) attributes.type, (String) attributes.disposition, (String) body())
  }