get_errors? fixed

src/storage/zone.cr

@@ -259,7 +259,7 @@ class DNSManager::Storage::Zone
 		io << "TEST"
 	end
 
-	def get_errors? : Array(Error)
+	def get_errors? : Array(Error)?
 		errors = [] of Error
 		unless Zone.is_domain_valid? @domain
 			errors << "invalid domain #{@domain}"
@@ -280,7 +280,11 @@ class DNSManager::Storage::Zone
 			errors << "invalid zone: no NS record"
 		end
 
-		errors
+		if errors.empty?
+			nil
+		else
+			errors
+		end
 	end
 
 	# This regex only is "good enough for now".