Set com.intellij.modules.java as optional dependency.

Author: Layoric

src/ServiceStackIDEA/src/main/resources/META-INF/plugin.xml

@@ -36,7 +36,7 @@
        on how to target different products -->
   <depends>com.intellij.modules.platform</depends>
   <depends>com.intellij.modules.lang</depends>
-  <depends>com.intellij.modules.java</depends>
+  <depends optional="true" config-file="META-INF/intellij.xml">com.intellij.modules.java</depends>
 
   <extensions defaultExtensionNs="com.intellij">
     <!-- Add your extensions here -->