Fix missing import in test

Author: mickaelistria

org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTConverter15JLS4Test.java

@@ -7796,7 +7796,7 @@ public void test0237() throws JavaModelException {
 		String contents =
 			"package test0237;\n" +
 			"public class X {\n" +
-			"	Zork foo() {}\n" +
+			"	Zork foo() {return null;}\n" +
 			"}";
 		ASTNode node = buildAST(
 				contents,

org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTConverter15JLS8Test.java

@@ -7749,7 +7749,7 @@ public void test0237() throws JavaModelException {
 		String contents =
 			"package test0237;\n" +
 			"public class X {\n" +
-			"	Zork foo() {}\n" +
+			"	Zork foo() {return null;}\n" +
 			"}";
 		ASTNode node = buildAST(
 				contents,

org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTConverter15Test.java

@@ -7795,7 +7795,7 @@ public void test0237() throws JavaModelException {
 		String contents =
 			"package test0237;\n" +
 			"public class X {\n" +
-			"	Zork foo() {}\n" +
+			"	Zork foo() {return null;}\n" +
 			"}";
 		ASTNode node = buildAST(
 				contents,