Visit else in while in any case even if condition is True (PY-28972)

But when condition is `True`, edge to `else` is not created.

python/testSrc/com/jetbrains/python/PyControlFlowBuilderTest.java

@@ -274,6 +274,11 @@ public class PyControlFlowBuilderTest extends LightMarkedTestCase {
     doTest();
   }
 
+  // PY-28972
+  public void testWhileTrueElse() {
+    doTest();
+  }
+
   private void doTestFirstStatement() {
     final String testName = getTestName(false).toLowerCase();
     configureByFile(testName + ".py");

python/testSrc/com/jetbrains/python/inspections/PyUnreachableCodeInspectionTest.java

@@ -117,6 +117,16 @@ public class PyUnreachableCodeInspectionTest extends PyInspectionTestCase {
     );
   }
 
+  // PY-28972
+  public void testWhileTrueElse() {
+    doTestByText(
+      "while True:\n" +
+      "    pass\n" +
+      "else:\n" +
+      "    <warning descr=\"This code is unreachable\">print(\"ok\")</warning>"
+    );
+  }
+
   @NotNull
   @Override
   protected Class<? extends PyInspection> getInspectionClass() {

python/testSrc/com/jetbrains/python/refactoring/PyExtractMethodTest.java

@@ -270,4 +270,9 @@ public class PyExtractMethodTest extends LightMarkedTestCase {
   public void testCommentsPrecedingSourceStatement() {
     doTest("func");
   }
+
+  // PY-28972
+  public void testInterruptedOuterLoop() {
+    doFail("foo", "Cannot perform refactoring when execution flow is interrupted");
+  }
 }