fix: Add default values to each yo-rc.json property (#226)

This prevents throwing nullpointer exceptions for cases where the values are null.

Fixes #223

src/main/java/io/github/jhipster/online/domain/deserializer/YoRCDeserializer.java

@@ -23,23 +23,23 @@ public YoRC deserialize(JsonParser jp, DeserializationContext ctxt) throws IOExc
         JsonNode node = jp.getCodec().readTree(jp);
 
         String serverPort = getDefaultIfNull(node.get("serverPort"), "8080");
-        String authenticationType = node.get("authenticationType").asText();
+        String authenticationType = getDefaultIfNull(node.get("authenticationType"), "");
         String cacheProvider = getDefaultIfNull(node.get("cacheProvider"), "no");
         boolean enableHibernateCache = getDefaultIfNull(node.get("enableHibernateCache"), false);
-        boolean webSocket = node.get("websocket").asBoolean();
-        String databaseType = node.get("databaseType").asText();
-        String devDatabaseType = node.get("devDatabaseType").asText();
-        String prodDatabaseType = node.get("prodDatabaseType").asText();
+        boolean webSocket = getDefaultIfNull(node.get("websocket"), false);
+        String databaseType = getDefaultIfNull(node.get("databaseType"), "");
+        String devDatabaseType = getDefaultIfNull(node.get("devDatabaseType"), "");
+        String prodDatabaseType = getDefaultIfNull(node.get("prodDatabaseType"), "");
         boolean searchEngine = getDefaultIfNull(node.get("searchEngine"), false);
         boolean messageBroker = getDefaultIfNull(node.get("messageBroker"), false);
         boolean serviceDiscoveryType = getDefaultIfNull(node.get("serviceDiscoveryType"), false);
-        String buildTool = node.get("buildTool").asText();
+        String buildTool = getDefaultIfNull(node.get("buildTool"), "");
         boolean enableSwaggerCodegen = getDefaultIfNull(node.get("enableSwaggerCodegen"), false);
         String clientFramework = getDefaultIfNull(node.get("clientFramework"), "none");
         boolean useSass = getDefaultIfNull(node.get("useSass"), false);
-        String clientPackageManager = node.get("clientPackageManager").asText();
-        String applicationType = node.get("applicationType").asText();
-        boolean enableTranslation = node.get("enableTranslation").asBoolean();
+        String clientPackageManager = getDefaultIfNull(node.get("clientPackageManager"), "");
+        String applicationType = getDefaultIfNull(node.get("applicationType"), "");
+        boolean enableTranslation = getDefaultIfNull(node.get("enableTranslation"), false);
         String nativeLanguage = getDefaultIfNull(node.get("nativeLanguage"), "");
         boolean hasProtractor = false;
         boolean hasGatling = false;