Add validations to datacite submission to prevent errors on bad data (DOECODE-984)

Author: jsamar2

src/main/java/gov/osti/doi/DataCite.java

@@ -169,6 +169,8 @@ private static void writeContributingOrganizations(XMLStreamWriter sw, List<Cont
             return;
 
         for ( ContributingOrganization contributingOrg : contributingOrgs ) {
+            if( null == contributingOrg.getContributorType() || StringUtils.isBlank(contributingOrg.getOrganizationName()))
+                continue;
             sw.writeStartElement("contributor");
             sw.writeAttribute("contributorType", contributingOrg.getContributorType().name());