title: Empty value to system properties in IDEA Run/Debug configuration
body: <p>I want to have "Run" configuration inside IntellJ IDEA with some java system properties predefined (ordinary and easy task). But by some reasons I need to set some properties to empty string -- which is not so easy in IDEA: </p>
  
  <pre><code>-Dmy-property=abd
  -Dmy-property2=
  -Dmy-property3=afd
  </code></pre>
  
  <p>if I enter this in "system properties" input, it will be converted to</p>
  
  <pre><code>-Dmy-property=abd
  -Dmy-property2=-Dmy-property3=afd
  </code></pre>
  
  <p>IDEA removed "unused" whitespaces. This is not desirable. Currently I can solve this only by moving empty property to th end of list. Is there any other way to enter emtpy property value?</p>