PackageDirectoryMismatchInspection: fix exception from empty script file

#KT-33437 Fixed

idea/src/org/jetbrains/kotlin/idea/refactoring/move/changePackage/PackageDirectoryMismatchInspection.kt

@@ -35,7 +35,7 @@ import org.jetbrains.kotlin.psi.psiUtil.startOffset
 class PackageDirectoryMismatchInspection : AbstractKotlinInspection() {
     override fun buildVisitor(holder: ProblemsHolder, isOnTheFly: Boolean) = packageDirectiveVisitor(fun(directive: KtPackageDirective) {
         val file = directive.containingKtFile
-        if (file.isInjectedFragment || file.packageMatchesDirectoryOrImplicit()) return
+        if (file.textLength == 0 || file.isInjectedFragment || file.packageMatchesDirectoryOrImplicit()) return
 
         val fixes = mutableListOf<LocalQuickFix>()
         val qualifiedName = directive.qualifiedName

idea/testData/multiFileInspections/mismatchedPackageDirectoryWithEmptyKts/expected.xml

@@ -0,0 +1,2 @@
+<problems>
+</problems>

idea/testData/multiFileInspections/mismatchedPackageDirectoryWithEmptyKts/mismatchedPackageDirectoryWithEmptyKts.test

@@ -0,0 +1,3 @@
+{
+    "inspectionClass": "org.jetbrains.kotlin.idea.refactoring.move.changePackage.PackageDirectoryMismatchInspection"
+}

idea/tests/org/jetbrains/kotlin/idea/codeInsight/MultiFileInspectionTestGenerated.java

@@ -49,6 +49,11 @@ public class MultiFileInspectionTestGenerated extends AbstractMultiFileInspectio
         runTest("idea/testData/multiFileInspections/mainInTwoModules/mainInTwoModules.test");
     }
 
+    @TestMetadata("mismatchedPackageDirectoryWithEmptyKts/mismatchedPackageDirectoryWithEmptyKts.test")
+    public void testMismatchedPackageDirectoryWithEmptyKts_MismatchedPackageDirectoryWithEmptyKts() throws Exception {
+        runTest("idea/testData/multiFileInspections/mismatchedPackageDirectoryWithEmptyKts/mismatchedPackageDirectoryWithEmptyKts.test");
+    }
+
     @TestMetadata("mismatchedProjectAndDirectory/mismatchedProjectAndDirectory.test")
     public void testMismatchedProjectAndDirectory_MismatchedProjectAndDirectory() throws Exception {
         runTest("idea/testData/multiFileInspections/mismatchedProjectAndDirectory/mismatchedProjectAndDirectory.test");