add some nil checks, and make lssi work with eatit changes

modules/lssi/lssi.lua

@@ -27,7 +27,7 @@ Takes an input file and code then, it outputs a file with your code in there.
 local mp = require('mp')
 
 mod = {
-  version = 'ALPHA 1', -- the current version of lssi
+  version = 'ALPHA 1.1', -- the current version of lssi
   author = 'squibid',
 }
 
@@ -58,6 +58,7 @@ local function openlog()
     fn = mp.command_native({'expand-path', opts.logging.logfile})
 
     f = io.open(fn, 'a') -- open file buffer
+    if not f then return end
     io.output(f) -- set it as default
   end
 end
@@ -109,13 +110,12 @@ local function checkandinject()
   openlog()
 
   for i = 1, tablelength(plugins) do
+    -- check if the plugin has been configured with lssi
+    if plugins[i]['lssi'] ~= nil then
       -- get the file we want to inject our code into
       local f = mp.command_native({'expand-path', '~~/'}) ..
-      '/' .. plugins[i]['dir'] ..
+        '/'..(plugins[i]['dir'] or 'scripts') ..
         '/'..plugins[i]['file']
-
-    -- check if the plugin has been configured with lssi
-    if plugins[i]['lssi'] then
       -- and the file we are trying to modify actually exists
       if fileexists(f) then
         -- inject it! no going back now