Code completion: minor changes after code review

idea/src/org/jetbrains/jet/plugin/completion/ExpectedInfos.kt

@@ -57,7 +57,7 @@ class ExpectedInfos(val bindingContext: BindingContext, val moduleDescriptor: Mo
         val callExpression = expressionWithType.getParent() as? JetCallExpression
         if (callExpression != null) {
             val arguments = callExpression.getFunctionLiteralArguments()
-            if (arguments.size > 0 && arguments[0] == expressionWithType) {
+            if (arguments.firstOrNull() == expressionWithType) {
                 return calculateForArgument(callExpression, callExpression.getValueArguments().size, true)
             }
         }
@@ -103,7 +103,7 @@ class ExpectedInfos(val bindingContext: BindingContext, val moduleDescriptor: Mo
             if (isFunctionLiteralArgument) {
                 if (argumentIndex != parameters.size - 1) continue
             }
-            else{
+            else {
                 if (parameters.size <= argumentIndex) continue
             }
             val parameterDescriptor = parameters[argumentIndex]

idea/src/org/jetbrains/jet/plugin/completion/JetCompletionResultSet.java

@@ -100,7 +100,7 @@ public class JetCompletionResultSet {
                         LookupElement lookupElement = DescriptorLookupConverter.createLookupElement(resolveSession, bindingContext, descriptor);
                         addElement(new LookupElementDecorator<LookupElement>(lookupElement) {
                             @Override
-                            public void renderElement(LookupElementPresentation presentation) {
+                            public void renderElement(@NotNull LookupElementPresentation presentation) {
                                 super.renderElement(presentation);
                                 presentation.setItemText(getLookupString() + " " + HandlersPackage.buildLambdaPresentation(parameterType));
                             }

idea/src/org/jetbrains/jet/plugin/completion/handlers/GenerateLambda.kt

@@ -75,7 +75,7 @@ private fun needExplicitParameterTypes(context: InsertionContext, placeholderRan
     if (functionTypes.size <= 1) return false
 
     val lambdaParameterCount = KotlinBuiltIns.getInstance().getParameterTypeProjectionsFromFunctionType(lambdaType).size
-    return functionTypes.filter { KotlinBuiltIns.getInstance().getParameterTypeProjectionsFromFunctionType(it).size == lambdaParameterCount}.size > 1
+    return functionTypes.filter { KotlinBuiltIns.getInstance().getParameterTypeProjectionsFromFunctionType(it).size == lambdaParameterCount }.size > 1
 }
 
 private fun buildTemplate(lambdaType: JetType, explicitParameterTypes: Boolean, project: Project): Template {