fix: Use default plugin if the path property is missing from a single plugin configuration

lib/plugins/index.js

@@ -1,4 +1,4 @@
-const {isArray} = require('lodash');
+const {isArray, isObject} = require('lodash');
 const DEFINITIONS = require('./definitions');
 const pipeline = require('./pipeline');
 const normalize = require('./normalize');
@@ -8,6 +8,10 @@ module.exports = (options, logger) =>
     const {config, output, default: def} = DEFINITIONS[pluginType];
     let pluginConfs;
     if (options[pluginType]) {
+      // If an object is passed and the path is missing, set the default one for single plugins
+      if (isObject(options[pluginType]) && !options[pluginType].path && !isArray(def)) {
+        options[pluginType].path = def;
+      }
       if (config && !config.validator(options[pluginType])) {
         throw new Error(config.message);
       }