Handle mod not found in data export

Handle the case of the mod file not being found from the mod version.
This could happen if the naming scheme is weird or the mod is unpacked.

packages/lib/factorio/export.js

@@ -90,7 +90,16 @@ async function loadFile(server, modVersions, modPath) {
 		}
 	}
 
-	let zip = await loadZip(server, modVersions, mod);
+	let zip;
+	try {
+		zip = await loadZip(server, modVersions, mod);
+	} catch (err) {
+		if (err.code === "ENOENT") {
+			return null;
+		}
+		throw err;
+	}
+
 	let file = zip.file(filePath);
 	if (!file) {
 		return null;
@@ -310,7 +319,15 @@ async function exportLocale(server, modVersions, modOrder, languageCode) {
 			continue;
 		}
 
-		let zip = await loadZip(server, modVersions, mod);
+		let zip;
+		try {
+			zip = await loadZip(server, modVersions, mod);
+		} catch (err) {
+			if (err.code === "ENOENT") {
+				continue;
+			}
+			throw err;
+		}
 		for (let file of zip.file(new RegExp(`locale\\/${languageCode}\\/.*\\.cfg`))) {
 			let content = await file.async("nodebuffer");
 			mergeLocale(ini.parse(content.toString("utf8")));