Handle empty starting script on Java side because of Remote Python Console (PY-25468)

python/helpers/pydev/_pydev_bundle/pydev_console_utils.py

@@ -356,6 +356,9 @@ class BaseInterpreterInterface:
             return False
 
     def execLine(self, line):
+        if not self.banner_shown:
+            line = self.build_banner() + line
+            self.banner_shown = True
         return self.do_exec_code(line, True)
 
     def execMultipleLines(self, lines):

python/helpers/pydev/pydevconsole.py

@@ -325,8 +325,6 @@ def start_console_server(host, port, interpreter):
         print(port)
         print(interpreter.client_port)
 
-    interpreter.execMultipleLines("")
-
     while True:
         try:
             server.serve_forever()

python/src/com/jetbrains/python/console/PydevConsoleRunnerImpl.java

@@ -699,6 +699,10 @@ public class PydevConsoleRunnerImpl implements PydevConsoleRunner {
           enableConsoleExecuteAction();
         }
 
+        if (statements2execute.length == 1 && statements2execute[0].isEmpty()) {
+          statements2execute[0] = "\t";
+        }
+
         for (String statement : statements2execute) {
           consoleView.executeStatement(statement + "\n", ProcessOutputTypes.SYSTEM);
         }

python/src/com/jetbrains/python/console/PythonConsoleView.java

@@ -295,7 +295,10 @@ public class PythonConsoleView extends LanguageConsoleImpl implements Observable
     VirtualFile file = getVirtualFile();
     if (PyConsoleUtil.detectIPythonImported(text, outputType)) {
       PyConsoleUtil.markIPython(file);
-      getExecuteActionHandler().updateConsoleState();
+      PythonConsoleExecuteActionHandler handler = getExecuteActionHandler();
+      if (handler != null) {
+        handler.updateConsoleState();
+      }
     }
     if (PyConsoleUtil.detectIPythonAutomagicOn(text)) {
       PyConsoleUtil.setIPythonAutomagic(file, true);

python/testSrc/com/jetbrains/env/python/console/PyConsoleTask.java

@@ -149,7 +149,7 @@ public class PyConsoleTask extends PyExecutionFixtureTestTask {
       new PydevConsoleRunnerImpl(project, sdk, PyConsoleType.PYTHON, myFixture.getTempDirPath(), Maps.newHashMap(),
                                  PyConsoleOptions.getInstance(project).getPythonConsoleSettings(),
                                  (s) -> {
-                                 }) {
+                                 }, PydevConsoleRunnerImpl.CONSOLE_START_COMMAND) {
         protected void showContentDescriptor(RunContentDescriptor contentDescriptor) {
           myContentDescriptorRef.set(contentDescriptor);
           super.showContentDescriptor(contentDescriptor);