Handle missing force setting in config.xml

Author: jdmulloy

src/main/java/org/jenkinsci/plugins/GithubSecurityRealm.java

@@ -108,6 +108,7 @@ public class GithubSecurityRealm extends AbstractPasswordBasedSecurityRealm impl
     private static final String DEFAULT_API_URI = "https://api.github.com";
     private static final String DEFAULT_ENTERPRISE_API_SUFFIX = "/api/v3";
     private static final String DEFAULT_OAUTH_SCOPES = "read:org,user:email";
+    private static final Boolean DEFAULT_FORCE_GITHUB_EMAIL = false;
 
     private String githubWebUri;
     private String githubApiUri;
@@ -320,6 +321,10 @@ public Object unmarshal(HierarchicalStreamReader reader,
                 realm.setGithubApiUri(DEFAULT_API_URI);
             }
 
+            if (realm.getForceGithubEmail() == null) {
+                realm.setForceGithubEmail(DEFAULT_FORCE_GITHUB_EMAIL);
+            }
+
             return realm;
         }
 
@@ -696,6 +701,10 @@ public String getDefaultOauthScopes() {
             return DEFAULT_OAUTH_SCOPES;
         }
 
+        public Boolean getDefaultForceGithubEmail() {
+            return DEFAULT_FORCE_GITHUB_EMAIL;
+        }
+
         public DescriptorImpl() {
             super();
             // TODO Auto-generated constructor stub