Do not print empty value attr for variable if not needed

In case RubyMine-specific protocol extensions are enabled we do not need to print value attr at all

ChangeLog.md

@@ -1,3 +1,7 @@
+## [0.4.24.beta5](https://github.com/ruby-debug/ruby-debug-ide/compare/v0.4.24.beta4...v0.4.24.beta5)
+
+* do not print empty value attr in case RubyMine-specific protocol extensions are enabled
+
 ## [0.4.24.beta4](https://github.com/ruby-debug/ruby-debug-ide/compare/v0.4.23...v0.4.24.beta4)
 
 * Performance optimisation for variable representation [RUBY-16055](https://youtrack.jetbrains.com/issue/RUBY-16055)

lib/ruby-debug-ide/version.rb

@@ -1,3 +1,3 @@
 module Debugger
-  IDE_VERSION='0.4.24.beta4'
+  IDE_VERSION='0.4.24.beta5'
 end

lib/ruby-debug-ide/xml_printer.rb

@@ -172,7 +172,7 @@ def print_variable(name, value, kind)
       end
       value_str = handle_binary_data(value_str)
       escaped_value_str = CGI.escapeHTML(value_str)
-      print("<variable name=\"%s\" %s kind=\"%s\" value=\"%s\" type=\"%s\" hasChildren=\"%s\" objectId=\"%#+x\">",
+      print("<variable name=\"%s\" %s kind=\"%s\" %s type=\"%s\" hasChildren=\"%s\" objectId=\"%#+x\">",
           CGI.escapeHTML(name), build_compact_value_attr(value), kind, build_value_attr(escaped_value_str), value.class,
           has_children, value.respond_to?(:object_id) ? value.object_id : value.id)
       print("<value><![CDATA[%s]]></value>", escaped_value_str) if Debugger.rm_protocol_extensions
@@ -371,7 +371,7 @@ def build_compact_value_attr(value)
     end
 
     def build_value_attr(escaped_value_str)
-      Debugger.rm_protocol_extensions ? '' : escaped_value_str
+      Debugger.rm_protocol_extensions ? '' : "value=\"#{escaped_value_str}\""
     end
 
     instance_methods.each do |m|