do not add conditional goto switch end when no default label present but all enum constants were mentioned (IDEA-68872)

java/java-tests/testData/inspection/dataFlow/switchEnum/expected.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<problems>
+  <problem>
+    <file>Test.java</file>
+    <line>72</line>
+    <description>Method invocation &lt;code&gt;foo.length()&lt;/code&gt; may produce &lt;code&gt;java.lang.NullPointerException&lt;/code&gt;</description>
+  </problem>
+</problems>

java/java-tests/testData/inspection/dataFlow/switchEnum/src/Test.java

@@ -0,0 +1,78 @@
+public class Test {
+  void withDefaultWithoutBreak(MyEnum e) {
+    String foo = null;
+    switch (e) {
+      case FOO:
+        foo = "foo";
+      case BAR:
+        foo = "bar";
+      default:
+        foo = "default";
+    }
+    int l = foo.length();
+  }
+
+  void withDefaultWithBreak(MyEnum e) {
+    String foo = null;
+    switch (e) {
+      case FOO:
+        foo = "foo";
+        break;
+      case BAR:
+        foo = "bar";
+        break;
+      default:
+        foo = "default";
+    }
+    int l = foo.length();
+  }
+
+  void withDefaultWithoutBar(MyEnum e) {
+    String foo = null;
+    switch (e) {
+      case FOO:
+        foo = "foo";
+        break;
+      default:
+        foo = "default";
+    }
+    int l = foo.length();
+  }
+
+  void withoutDefaultWithBreak(MyEnum e) {
+    String foo = null;
+    switch (e) {
+      case FOO:
+        foo = "foo";
+        break;
+      case BAR:
+        foo = "bar";
+        break;
+    }
+    int l = foo.length();
+  }
+
+  void withoutDefaultWithoutBreak(MyEnum e) {
+    String foo = null;
+    switch (e) {
+      case FOO:
+        foo = "foo";
+      case BAR:
+        foo = "bar";
+    }
+    int l = foo.length();
+  }
+
+  void withoutDefaultWithoutBar(MyEnum e) {
+    String foo = null;
+    switch (e) {
+      case FOO:
+        foo = "foo";
+    }
+    int l = foo.length();
+  }
+}
+
+enum MyEnum {
+  FOO, BAR;
+}