fixed error in link tag with reverse url mappings

git-svn-id: https://svn.codehaus.org/grails/trunk@3968 1cfb16fd-6d17-0410-8ff1-b7e8e1e2867d

Author: graeme

src/grails/grails-app/taglib/ApplicationTagLib.groovy

@@ -85,11 +85,20 @@ class ApplicationTagLib {
 
 		def controller = attrs.remove("controller")
 		def action = attrs.remove("action")
-		def params = attrs.remove("params")
+		def params = attrs.params ? attrs.remove('params') : [:]
 		def mapping = grailsUrlMappingsHolder?.getReverseMapping(controller, 
 																 action, 
 																 params)
-        def url = mapping?.createURL(params)
+        def url
+		try {       
+			params.controller = controller
+			if(action) params.action = action
+			url = mapping?.createURL(params)
+		}        
+		finally {
+			params.remove('controller')
+			params.remove('action')
+		}
 		if(url) {
 			out << url
 		}             
@@ -143,7 +152,7 @@ class ApplicationTagLib {
 				} 				
 			}
 		}
-		out << '>'
+		out << '>'  
 		out << body()
 		out << "</${attrs.name}>"			
 	}