title: Is there a more compact way to write this ROR code?
body: <p>Is there a more compact way to write the following code.  I would like to get rid of the line that assigns the empty string when flash[:add_run_error] is nil.</p>
  
  <pre><code>unless run.save 
    run.errors.each do |attr, msg|  
      flash[:add_run_error] += '&lt;br/&gt;' if flash[:add_run_error] 
      flash[:add_run_error] = '' unless flash[:add_run_error] 
      flash[:add_run_error] += "Invalid #{attr}.  Follow examples below." 
    end 
  end
  </code></pre>