code: function isAppendEmptyString(node) {
  		return node.operator === "+=" && node.right.type === "Literal" && node.right.value === "";
  	}
docs: Checks whether or not a node is appended with an empty string.
  @param {ASTNode} node - An AssignmentExpression node to check.
  @returns {boolean} Whether or not the node is appended with an empty string.