Remove jetbrains annotations inserted by IDE

Author: rstoyanchev

spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/ModelInitializer.java

@@ -23,7 +23,6 @@
 import java.util.Optional;
 import java.util.stream.Collectors;
 
-import org.jetbrains.annotations.NotNull;
 import reactor.core.publisher.Mono;
 
 import org.springframework.core.Conventions;
@@ -104,7 +103,6 @@ public Mono<Void> initModel(HandlerMethod handlerMethod, InitBinderBindingContex
 				});
 	}
 
-	@NotNull
 	private Mono<Void> invokeModelAttributeMethods(BindingContext bindingContext,
 			List<InvocableHandlerMethod> modelMethods, ServerWebExchange exchange) {
 

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ModelInitializerTests.java

@@ -23,7 +23,6 @@
 import java.util.Map;
 import java.util.stream.Collectors;
 
-import org.jetbrains.annotations.NotNull;
 import org.junit.Before;
 import org.junit.Test;
 import reactor.core.publisher.Mono;
@@ -208,7 +207,6 @@ public void clearModelAttributeFromSession() throws Exception {
 	}
 
 
-	@NotNull
 	private InitBinderBindingContext getBindingContext(Object controller) {
 
 		List<SyncInvocableHandlerMethod> binderMethods =