Fail gracefully on empty output from hdevtools.

In insert_type() : Exit with an error message if hdevtools doesn't
recognize any type information at a given location.

Author: annaluiseblume

autoload/hdevtools.vim

@@ -588,6 +588,10 @@ function! hdevtools#insert_type()
   endif
 
   let l:pos_lines = split(l:output_for_pos, '\n')
+  if len(l:pos_lines) == 0
+    call hdevtools#print_error('hdevtools#insert_type: No Type Information. hdevtools answered: ' . l:output_for_pos)
+    return
+  endif
   let l:pos_last_line = l:pos_lines[-1]
   let l:pos_last_line_parsed = matchlist(l:pos_last_line, '\(\d\+\) \(\d\+\) \(\d\+\) \(\d\+\) "\([^"]\+\)"')
   if len(l:pos_last_line_parsed) == 0