Fix a field that is nullable in some cases causing processing issues

src/main/java/org/eclipsefoundation/git/eca/api/models/GithubCommit.java

@@ -106,6 +106,7 @@ public abstract class GithubCommit {
     @AutoValue
     @JsonDeserialize(builder = AutoValue_GithubCommit_GithubCommitUser.Builder.class)
     public abstract static class GithubCommitUser {
+        @Nullable
         public abstract String getLogin();
 
         public static Builder builder() {
@@ -115,7 +116,7 @@ public abstract class GithubCommit {
         @AutoValue.Builder
         @JsonPOJOBuilder(withPrefix = "set")
         public abstract static class Builder {
-            public abstract Builder setLogin(String login);
+            public abstract Builder setLogin(@Nullable String login);
 
             public abstract GithubCommitUser build();
         }

src/main/java/org/eclipsefoundation/git/eca/service/impl/DefaultValidationService.java

@@ -121,10 +121,10 @@ public class DefaultValidationService implements ValidationService {
     /**
      * Using serial/blocking processing, process the validation request.
      * 
-     * @param req
-     * @param filteredProjects
-     * @param statuses
-     * @return
+     * @param req the request to validate
+     * @param filteredProjects tracked projects for the current request
+     * @param statuses list containing historic status history for the given request
+     * @return validated response parts for the request to be recombined, persisted, and returned.
      */
     private List<ValidationResponsePart> doSerialProcessing(ValidationRequest req, List<Project> filteredProjects,
             List<CommitValidationStatus> statuses) {
@@ -138,10 +138,10 @@ public class DefaultValidationService implements ValidationService {
     /**
      * Using parallel processing, process the validation request.
      * 
-     * @param req
-     * @param filteredProjects
-     * @param statuses
-     * @return
+     * @param req the request to validate
+     * @param filteredProjects tracked projects for the current request
+     * @param statuses list containing historic status history for the given request
+     * @return validated response parts for the request to be recombined, persisted, and returned.
      */
     private List<ValidationResponsePart> doParallelProcessing(ValidationRequest req, List<Project> filteredProjects,
             List<CommitValidationStatus> statuses) {