[gwt-contrib] Add assert for null provided fields, fixes #7024 (issue1604803)

[stephen . haberman]

Reviewers: rchandia, tbroyer,


Please review this at http://gwt-code-reviews.appspot.com/1604803/

Affected files:
  M user/src/com/google/gwt/uibinder/rebind/AbstractFieldWriter.java


Index: user/src/com/google/gwt/uibinder/rebind/AbstractFieldWriter.java
diff --git  
a/user/src/com/google/gwt/uibinder/rebind/AbstractFieldWriter.java  
b/user/src/com/google/gwt/uibinder/rebind/AbstractFieldWriter.java
index  
6ad03940fce76a4ee06234e9a8b2964562f63f57..24341a682e6ce4f7277d93d64cb64361c80e8b08  
100644
--- a/user/src/com/google/gwt/uibinder/rebind/AbstractFieldWriter.java
+++ b/user/src/com/google/gwt/uibinder/rebind/AbstractFieldWriter.java
@@ -250,6 +250,9 @@ abstract class AbstractFieldWriter implements  
FieldWriter {
     w.indent();

     w.write("// Creation section.");
+    if (ownerField != null && ownerField.isProvided()) {
+      w.write("assert owner.%s != null : \"UiField %s with 'provided =  
true' was null\";", name, name);
+    }
     if (getterCount > 1) {
       w.write("%s = %s;", name, initializer);
     } else {


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