[python] PY-87784, PY-87782: pytest output is not formatted correctly

Fix pytest test results merging into a single line in the Debug console.
Also fix PY-87784 NPE when trying to view the value of a variable 
after the code has finished running in the console.

Merge-request: IJ-MR-192615
Merged-by: Egor Eliseev <Egor.Eliseev@jetbrains.com>

(cherry picked from commit 03dbea8699aadd447456b23fdefd55b950038bba)

IJ-MR-192615

GitOrigin-RevId: 6d584e764f9369167c43d179777aa4966081d951

python/pydevSrc/resources/messages/PydevBundle.properties

@@ -3,4 +3,5 @@ pydev.show.value=Show Value
 pydev.view.as=...View as {0}
 pydev.view.as.image=...View as Image
 pydev.value.protected.attributes.group.name=Protected Attributes
-pydev.error.message.failed.to.find.free.socket.port=Failed to find a free socket port
+pydev.error.message.failed.to.find.free.socket.port=Failed to find a free socket port
+pydev.session.finished=Session has ended

python/pydevSrc/src/com/jetbrains/python/debugger/PyFullValueEvaluator.java

@@ -3,6 +3,7 @@ package com.jetbrains.python.debugger;
 
 import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.xdebugger.frame.XFullValueEvaluator;
+import com.jetbrains.python.PydevBundle;
 import org.jetbrains.annotations.Nls;
 import org.jetbrains.annotations.NotNull;
 
@@ -45,6 +46,10 @@ public class PyFullValueEvaluator extends XFullValueEvaluator {
     ApplicationManager.getApplication().executeOnPooledThread(() -> {
       try {
         final PyDebugValue value = myDebugProcess.evaluate(expression, false, doTrunc);
+        if (value == null) {
+          callback.evaluated(PydevBundle.message("pydev.session.finished"));
+          return;
+        }
         if (value.getValue() == null) {
           throw new PyDebuggerException("Failed to Load Value");
         }