[java-psi] LightFieldBuilder: make hasInitializer and getInitializer consistent

Fixes IDEA-265211 2020.3 Update is causing a lombok error using log in static block

Co-authored-by: Michail Plushnikov <michail.plushnikov@jetbrains.com>

GitOrigin-RevId: 76f271c26948d4f6815a0404723c8e0466fb0c1e

java/java-psi-impl/src/com/intellij/psi/impl/light/LightFieldBuilder.java

@@ -59,6 +59,11 @@ public class LightFieldBuilder extends LightVariableBuilder<LightFieldBuilder> i
     return myInitializer;
   }
 
+  @Override
+  public boolean hasInitializer() {
+    return myInitializer != null;
+  }
+
   @Override
   public PsiDocComment getDocComment() {
     return myDocComment;

plugins/lombok/src/test/java/com/intellij/java/lomboktest/LombokHighlightingTest.java

@@ -49,6 +49,10 @@ public class LombokHighlightingTest extends LightDaemonAnalyzerTestCase {
 
   public void testLombokBasics() { doTest(); }
 
+  public void testLombokStaticVars() {
+    doTest();
+  }
+
   @NotNull
   @Override
   protected LightProjectDescriptor getProjectDescriptor() {

plugins/lombok/testData/highlighting/LombokStaticVars.java

@@ -0,0 +1,22 @@
+package org.slf4j;
+
+import lombok.extern.slf4j.Slf4j;
+
+interface <warning descr="Interface 'Logger' is never used">Logger</warning> {
+  void info(String msg);
+}
+
+@Slf4j
+public class LombokStaticVars {
+    static {
+        log.info("This should not produce error: Variable 'log' might not have been initialized");
+    }
+
+    public static final Runnable LAMDA = () -> {
+        log.info("This should not produce error: Variable 'log' might not have been initialized");
+    };
+
+  public static void main(String[] args) {
+    LAMDA.run();
+  }
+}