Remove unnecessary line

lspace is always nil here, as it is initialized to nil and the
only place it is set to non-nil is in the unless ch == '=' block,
when is never taken when taking the case ch when '=' block.

Author: jeremyevans

lib/erubi.rb

@@ -137,7 +137,6 @@ def initialize(input, properties={})
         case ch
         when '='
           rspace = nil if tailch && !tailch.empty?
-          add_text(lspace) if lspace
           add_expression(indicator, code)
           add_text(rspace) if rspace
         when '#'