try catch block added for formatting parameters process (#6999)

* try catch block added for formatting parameters process

* new line space added before braces

* query function processing wrapped to Promise.try

* processQuery method removed from var

* binding context changed to arrow function

* promise.try chaining added

* extra Promise.resolve removed code refactored

* space added

* test cases for 'query' method updated with respect to new rejection structure instead of throwing error

* it block messages corrected

* return added and code structured

* line space added

* line space added

* code style fixed

lib/sequelize.js

@@ -455,12 +455,11 @@ class Sequelize {
    *
    * @see {@link Model#build} for more information about instance option.
    */
+
   query(sql, options) {
-    if (arguments.length > 2) {
-      // TODO: Remove this note in the next major version (4.0)
-      throw new Error('Sequelize.query was refactored to only use the parameters `sql` and `options`. Please read the changelog about BC.');
-    }
+    let bindParameters;
 
+    return Promise.try(() => {
       options = _.assign({}, this.options.query, options);
 
       if (options.instance && !options.model) {
@@ -477,7 +476,6 @@ class Sequelize {
           if (options.replacements !== undefined) {
             throw new Error('Both `sql.values` and `options.replacements` cannot be set at the same time');
           }
-
           options.replacements = sql.values;
         }
 
@@ -485,7 +483,6 @@ class Sequelize {
           if (options.bind !== undefined) {
             throw new Error('Both `sql.bind` and `options.bind` cannot be set at the same time');
           }
-
           options.bind = sql.bind;
         }
 
@@ -503,15 +500,15 @@ class Sequelize {
       if (options.replacements && options.bind) {
         throw new Error('Both `replacements` and `bind` cannot be set at the same time');
       }
+      
       if (options.replacements) {
         if (Array.isArray(options.replacements)) {
           sql = Utils.format([sql].concat(options.replacements), this.options.dialect);
-      }
-      else {
+        } else {
           sql = Utils.formatNamedParameters(sql, options.replacements, this.options.dialect);
         }
       }
-    let bindParameters;
+
       if (options.bind) {
         const bindSql = this.dialect.Query.formatBindParameters(sql, options.bind, this.options.dialect);
         sql = bindSql[0];
@@ -555,12 +552,10 @@ class Sequelize {
         //then set to DEFAULT if none is provided
         options.searchPath = 'DEFAULT';
       }
-
-    return Promise.resolve(
-      options.transaction ? options.transaction.connection : this.connectionManager.getConnection(options)
-    ).then(connection => {
-
+      return options.transaction ? options.transaction.connection : this.connectionManager.getConnection(options);
+    }).then(connection => {
       const query = new this.dialect.Query(connection, this, options);
+
       return retry(() => query.run(sql, bindParameters).finally(() => {
         if (!options.transaction) {
           return this.connectionManager.releaseConnection(connection);