#307 fixes and cleanup

graphics/elements/indicators/power.lua

@@ -23,7 +23,7 @@ local element = require("graphics.element")
 ---@param args power_indicator_args
 ---@return graphics_element element, element_id id
 local function power(args)
-    element.assert(type(args.value) == "number", "value is a required number field")
+    element.assert(type(args.value) == "number", "value is a required field")
     element.assert(util.is_int(args.width), "width is a required field")
 
     args.height = 1

graphics/elements/indicators/rad.lua

@@ -33,7 +33,7 @@ local function rad(args)
     -- create new graphics element base object
     local e = element.new(args)
 
-    e.value = types.new_zero_radiation_reading()
+    e.value = args.value or types.new_zero_radiation_reading()
 
     local label_len = string.len(args.label)
     local data_start = 1