fix(#1923): handle empty git icons (#1952)

* 1923 skip empty git icons

* 1923 skip empty git icons

Author: alex-courtis

lua/nvim-tree/renderer/components/git.lua

@@ -79,9 +79,11 @@ local function get_icons_(node)
     end
 
     for _, icon in pairs(icons) do
-      if not inserted[icon] then
-        table.insert(iconss, icon)
-        inserted[icon] = true
+      if #icon.str > 0 then
+        if not inserted[icon] then
+          table.insert(iconss, icon)
+          inserted[icon] = true
+        end
       end
     end
   end