KeyValuePage: Handle nil/empty kvp arrays (#9705)

frontend/ui/widget/keyvaluepage.lua

@@ -291,6 +291,7 @@ local KeyValuePage = FocusManager:extend{
 }
 
 function KeyValuePage:init()
+    self.kv_pairs = self.kv_pairs or {}
     self.dimen = Geom:new{
         x = 0,
         y = 0,
@@ -594,7 +595,8 @@ function KeyValuePage:_populateItems()
     local unfit_items_count -- count item that needs to move or truncate key/value, not fit 1/2 ratio
     -- first we check if no unfit item at all
     local width_ratio
-    if key_widths[#key_widths] <= key_w and value_widths[#value_widths] <= value_w then
+    if (#self.kv_pairs == 0) or
+        (key_widths[#key_widths] <= key_w and value_widths[#value_widths] <= value_w) then
         width_ratio = 1/2
     end
     if not width_ratio then