resolved isempty() overloaded builtin

src/ruby/ycp/builtins.rb

@@ -58,6 +58,13 @@ def self.foreach
       raise "Builtin foreach() is not implemented yet"
     end
 
+    # - Returns whether the map m is empty.
+    # - Returns whether the string s is empty.
+    # - Returns whether the list l is empty.
+    def self.isempty
+      raise "Builtin isempty() is not implemented yet"
+    end
+
 
     ###########################################################
     # YCP Byteblock Builtins
@@ -144,11 +151,6 @@ def self.flatten
       raise "Builtin flatten() is not implemented yet"
     end
 
-    # Returns whether the list l is empty.
-    def self.isempty
-      raise "Builtin isempty() is not implemented yet"
-    end
-
     module List
       # Reduces a list to a single value.
       def self.reduce
@@ -277,11 +279,6 @@ def self.haskey
       raise "Builtin haskey() is not implemented yet"
     end
 
-    # Returns whether the map m is empty.
-    def self.isempty
-      raise "Builtin isempty() is not implemented yet"
-    end
-
     # Select a map element (deprecated, use MAP[KEY]:DEFAULT)
     def self.lookup
       raise "Builtin lookup() is not implemented yet"
@@ -499,11 +496,6 @@ def self.findlastof
       raise "Builtin findlastof() is not implemented yet"
     end
 
-    # Returns whether the string s is empty.
-    def self.isempty
-      raise "Builtin isempty() is not implemented yet"
-    end
-
     # issubstring() YCP built-in
     # searches for a specific string within another string
     def self.issubstring string, substring