Avoid NotNull assertion in credential testing

platform/platform-impl/src/com/intellij/remote/VagrantCredentialsException.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.remote;
+
+/**
+ * @author traff
+ */
+public class VagrantCredentialsException extends RuntimeException {
+  private String myVagrantFolder;
+
+  public VagrantCredentialsException(String message, String vagrantFolder) {
+    super(message);
+    myVagrantFolder = vagrantFolder;
+  }
+
+  public String getVagrantFolder() {
+    return myVagrantFolder;
+  }
+}

python/src/com/jetbrains/python/remote/PythonRemoteInterpreterManager.java

@@ -145,7 +145,7 @@ public abstract class PythonRemoteInterpreterManager {
 
   public abstract SdkAdditionalData loadRemoteSdkData(Sdk sdk, Element additional);
 
-  public abstract boolean testConnection(RemoteCredentials credentials);
+  public abstract boolean testConnection(@NotNull RemoteCredentials credentials);
 
   public abstract PyConsoleProcessHandler createConsoleProcessHandler(Process process,
                                                                       PyRemoteSdkCredentials data,