Added @ExpectLoadErrors annotations to test data.

Also, fixed syntax error in AddNullabilitySameJavaType.

compiler/testData/loadJava/kotlinSignature/error/SyntaxError.java

@@ -1,8 +1,10 @@
 package test;
 
 import jet.runtime.typeinfo.KotlinSignature;
+import org.jetbrains.jet.jvm.compiler.annotation.ExpectLoadError;
 
 public class SyntaxError {
+    @ExpectLoadError("Alternative signature has 2 syntax errors, first is at 8: Expecting a parameter declaration")
     @KotlinSignature("fun foo(,) : Int")
     public Integer foo() {
         throw new UnsupportedOperationException();