prefer to use allSettings where we actually need to use settings or don't need configuration at all

add hasSettings (later we can optimize it to avoid linear search)
no need in the myUnloadedElements since for unknown element UnknownRunConfiguration will be created

java/testFramework/src/com/intellij/debugger/DebuggerTestCase.java

@@ -512,7 +512,7 @@ public abstract class DebuggerTestCase extends ExecutionWithDebuggerToolsTestCas
 
     @Override
     public ConfigurationFactory getFactory() {
-      return null;
+      return UnknownConfigurationType.FACTORY;
     }
 
     @Override
@@ -529,12 +529,6 @@ public abstract class DebuggerTestCase extends ExecutionWithDebuggerToolsTestCas
       return null;
     }
 
-    @Override
-    @NotNull
-    public ConfigurationType getType() {
-      return UnknownConfigurationType.INSTANCE;
-    }
-
     @Override
     public RunConfiguration clone() {
       return null;