Handle null dates without crashing

app/src/main/java/com/commit451/gitlab/api/MoshiProvider.kt

@@ -10,7 +10,7 @@ object MoshiProvider {
     val moshi: Moshi by lazy {
         Moshi.Builder()
                 .add(DashDateAdapter())
-                .add(Date::class.java, Rfc3339DateJsonAdapter())
+                .add(Date::class.java, Rfc3339DateJsonAdapter().nullSafe())
                 .build()
     }
 }
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