function findSymbol (a) {
					return a.some(function (o) {
						var bFound = o.name === sTopicId;
						if (!bFound && o.nodes) {
							return findSymbol(o.nodes);
						} else if (bFound) {
							oEntityData = o;
							return true;
						}
						return false;
					});
				}
Process data from api-index file and if symbol is found load the corresponding api.json file for the
symbol library. If the symbol is not resolved this method returns a rejected promise which triggers
navigation to not found page.
@param {array} aData data from api-index file
@return {Promise} resolved or rejected promise
@private