Fixes couple exceptions

idea/src/org/jetbrains/jet/plugin/completion/handlers/JetFunctionInsertHandler.java

@@ -90,7 +90,7 @@ public class JetFunctionInsertHandler implements InsertHandler<LookupElement> {
             // Insert () if it's not already exist
             document.insertString(endOffset, "()");
             bothParentheses = true;
-        } else if (endOffset + 1 < documentText.length() && documentText.charAt(endOffset) == ')') {
+        } else if (endOffset + 1 < documentText.length() && documentText.charAt(endOffset + 1) == ')') {
             bothParentheses = true;
         }
 

idea/src/org/jetbrains/jet/plugin/formatter/JetFormattingModelBuilder.java

@@ -44,6 +44,8 @@ public class JetFormattingModelBuilder implements FormattingModelBuilder {
 
     private static SpacingBuilder createSpacingBuilder(CodeStyleSettings settings) {
         return new SpacingBuilder(settings)
+                .after(NAMESPACE_HEADER).blankLines(1)
+
                 .before(IMPORT_DIRECTIVE).lineBreakInCode()
                 .between(IMPORT_DIRECTIVE, CLASS).blankLines(1)
                 .between(IMPORT_DIRECTIVE, FUN).blankLines(1)

idea/src/org/jetbrains/jet/plugin/quickfix/ImportClassHelper.java

@@ -89,9 +89,14 @@ public class ImportClassHelper {
         }
         else {
             List<JetDeclaration> declarations = file.getDeclarations();
-            assert !declarations.isEmpty();
+
-            JetDeclaration firstDeclaration = declarations.iterator().next();
+            if (!declarations.isEmpty()) {
-            firstDeclaration.getParent().addBefore(newDirective, firstDeclaration);
+                JetDeclaration firstDeclaration = declarations.iterator().next();
+                firstDeclaration.getParent().addBefore(newDirective, firstDeclaration);
+            }
+            else {
+                file.getNamespaceHeader().getParent().addAfter(newDirective, file.getNamespaceHeader());
+            }
         }
     }
 

idea/tests/org/jetbrains/jet/plugin/quickfix/ImportClassHelperTest.java

@@ -21,6 +21,8 @@ import com.intellij.openapi.application.ApplicationManager;
 import org.jetbrains.jet.lang.psi.JetFile;
 import org.jetbrains.jet.plugin.PluginTestCaseBase;
 
+import java.io.IOException;
+
 /**
  * @author Nikolay Krasko
  */
@@ -48,6 +50,30 @@ public class ImportClassHelperTest extends LightDaemonAnalyzerTestCase {
         checkResultByFile(getTestName(false) + ".kt.after");
     }
 
+    public void testInsertInEmptyFile() throws IOException {
+        configureFromFileText("testInsertInEmptyFile.kt", "");
+        ApplicationManager.getApplication().runWriteAction(new Runnable() {
+            @Override
+            public void run() {
+                ImportClassHelper.addImportDirective("java.util.ArrayList", (JetFile) getFile());
+            }
+        });
+
+        checkResultByText("import java.util.ArrayList");
+    }
+
+    public void testInsertInPackageOnlyFile() throws IOException {
+        configureFromFileText("testInsertInPackageOnlyFile.kt", "package some");
+        ApplicationManager.getApplication().runWriteAction(new Runnable() {
+            @Override
+            public void run() {
+                ImportClassHelper.addImportDirective("java.util.ArrayList", (JetFile) getFile());
+            }
+        });
+
+        checkResultByText("package some\n\nimport java.util.ArrayList");
+    }
+
     @Override
     protected String getTestDataPath() {
         return PluginTestCaseBase.getTestDataPathBase() + "/quickfix/importHelper/";