console.lua: don't crash when scrolling without matches

selected_match can become 0 when pressing certain scrolling
keybindings without any match, and

for i = first_match_to_print, last_match_to_print do

in populate_log_with_matches() runs from 0 to 0 and accessing
matches[0].text crashes console.lua. Return early when it is 0.

player/lua/console.lua

@@ -363,7 +363,7 @@ local function fuzzy_find(needle, haystacks)
 end
 
 local function populate_log_with_matches(max_width)
-    if not selectable_items then
+    if not selectable_items or selected_match == 0 then
         return
     end