No error when SVG for path doesn't exist

[strarsis]

Currently, the plugin fails silently when an SVG file doesn't exist for the path.
Instead, the svg-loader(...) part is simply kept in the CSS output.

[agebhar1]

@strarsis I hit the same error. After some debugging I figured out that a race condition is the reason for the non replaced svg-loader(...). A Gulp based build process the SVG files and the CSS in parallel. The error occurs sporadic. The file exists but w/o content, so

postcss-inline-svg/lib/load.js

Lines 11 to 21 in f5c0fee

	function read(id) {
	return new Promise((resolve, reject) => {
	readFile(id, "utf-8", (err, data) => {
	if (err) {
	reject(Error(`Can't load '${id}'`));
	} else {
	resolve(data);
	}
	});
	});
	}

does not throw an error.

It was visible after adding some debugging code:

function read(id) {
    return new Promise(function (resolve, reject) {
        fs.readFile(id, 'utf-8', function (err, data) {

            var _data = fs.readFileSync(id)

            if (data === "") {
                console.error("Hit");
                console.log("async: " + data.length);
                console.log("sync:  " + _data.length);
            }

            if (err) {
                reject(Error(`Can't load '${id}'`));
            } else {
                resolve(data);
            }
        });
    });
}

The console shows in my case:

Hit
async: 0
sync:  5829