Find Usages: Fix NPE on constructor with missing name

#EA-69907 Fixed

compiler/frontend/src/org/jetbrains/kotlin/psi/JetConstructor.kt

@@ -66,9 +66,9 @@ public abstract class JetConstructor<T : JetConstructor<T>> : JetDeclarationStub
 
     override fun getTypeParameters() = emptyList<JetTypeParameter>()
 
-    override fun getName(): String = getContainingClassOrObject().getName()!!
+    override fun getName(): String? = getContainingClassOrObject().getName()
 
-    override fun getNameAsSafeName() = Name.identifier(getName())
+    override fun getNameAsSafeName() = JetPsiUtil.safeName(getName())
 
     override fun getFqName() = null
 

idea/testData/findUsages/kotlin/findPrimaryConstructorUsages/missingName.0.kt

@@ -0,0 +1,5 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetPrimaryConstructor
+// OPTIONS: usages
+class <caret>() {
+
+}

idea/testData/findUsages/kotlin/findPrimaryConstructorUsages/missingName.results.txt

@@ -0,0 +1 @@
+

idea/tests/org/jetbrains/kotlin/findUsages/JetFindUsagesTestGenerated.java

@@ -756,6 +756,12 @@ public class JetFindUsagesTestGenerated extends AbstractJetFindUsagesTest {
                 JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/findUsages/kotlin/findPrimaryConstructorUsages"), Pattern.compile("^(.+)\\.0\\.kt$"), true);
             }
 
+            @TestMetadata("missingName.0.kt")
+            public void testMissingName() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findPrimaryConstructorUsages/missingName.0.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("primaryConstructorByRef.0.kt")
             public void testPrimaryConstructorByRef() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findPrimaryConstructorUsages/primaryConstructorByRef.0.kt");