Fix HTTP server not shutting down after unexpected errors

Author: rastating

lib/wpxf/net/http_server.rb

@@ -86,7 +86,7 @@ def start_http_server(non_block = false)
   def stop_http_server
     emit_info 'Stopping HTTP server...', true
     @http_server_kill_switch = true
-    @http_server_thread.exit if @http_server_thread
+    @http_server_thread&.exit
     @tcp_server.close if !@tcp_server.nil? && !@tcp_server.closed?
     emit_info 'HTTP server stopped'
   end
@@ -147,11 +147,10 @@ def http_server_loop
     rescue SignalException
       emit_warning 'Caught kill signal', true
     rescue StandardError => e
-      emit_warning "Socket error: #{e}", true
+      emit_error "Socket error: #{e}"
     end
 
-    @tcp_server.close if !@tcp_server.nil? && !@tcp_server.closed?
-    @http_server_kill_switch = false
+    stop_http_server
   end
 
   def handle_incoming_http_request(socket)