fix(finder): followup to #2442, make sure entry is not nil (#2526)

lua/telescope/finders.lua

@@ -75,7 +75,9 @@ function JobFinder:_find(prompt, process_result, process_complete)
     local entry
     if self.entry_maker then
       entry = self.entry_maker(line)
+      if entry then
         entry.index = line_num
+      end
     else
       entry = line
     end
@@ -141,7 +143,9 @@ function DynamicFinder:_find(prompt, process_result, process_complete)
   for _, result in ipairs(results) do
     result_num = result_num + 1
     local entry = self.entry_maker(result)
+    if entry then
       entry.index = result_num
+    end
     if process_result(entry) then
       return
     end

lua/telescope/finders/async_job_finder.lua

@@ -60,7 +60,9 @@ return function(opts)
     for line in stdout:iter(true) do
       line_num = line_num + 1
       local entry = entry_maker(line)
+      if entry then
         entry.index = line_num
+      end
       if process_result(entry) then
         return
       end

lua/telescope/finders/async_oneshot_finder.lua

@@ -71,7 +71,9 @@ return function(opts)
           end
 
           local entry = entry_maker(line)
+          if entry then
             entry.index = num_results
+          end
           results[num_results] = entry
           process_result(entry)
         end