Fix empty directory crashes (local and remote) for sync

lib/expandMatch.js

@@ -20,24 +20,33 @@ var filterFile = function(file, patterns, strict) {
 // returns all files that match
 var expand = async function(from, dir, patterns) {
   var fullDir = path.join(from, dir);
-  var files = await fs.readdir(fullDir);
+  try {
+    var files = await fs.readdir(fullDir);
+  } catch (err) {
+    console.log(`Unable to read directory ${fullDir} - does it exist?`);
+    return [];
+  }
   var matching = [];
   var affirmative = patterns.filter(p => p[0] != "!");
   var negative = patterns.filter(p => p[0] == "!");
   for (var i = 0; i < files.length; i++) {
     var f = files[i];
     var full = path.join(from, dir, f);
     var relative = path.relative(from, full);
-    var stat = await fs.stat(full);
-    if (stat.isDirectory()) {
-      var children = await expand(from, relative, patterns);
-      matching.push(...children);
-    } else {
-      var matched = filterFile(relative, affirmative);
-      var notExcluded = filterFile(relative, negative, true);
-      if (matched && notExcluded) {
-        matching.push(full);
+    try {
+      var stat = await fs.stat(full);
+      if (stat.isDirectory()) {
+        var children = await expand(from, relative, patterns);
+        matching.push(...children);
+      } else {
+        var matched = filterFile(relative, affirmative);
+        var notExcluded = filterFile(relative, negative, true);
+        if (matched && notExcluded) {
+          matching.push(full);
+        }
       }
+    } catch (err) {
+      console.log(`Unable to expand matches for path ${f}`);
     }
   }
   return matching;

lib/s3.js

@@ -60,7 +60,7 @@ var download = async function (Bucket, Key) {
 // get a single page of results from S3
 var getRemote = async function (Bucket, Prefix, Marker = null) {
   var results = await s3.send(new ListObjectsV2Command({ Bucket, Prefix, Marker }));
-  var items = results.Contents.map(function (obj) {
+  var items = (results.Contents || []).map(function (obj) {
     return {
       file: obj.Key.replace(/.*\/synced\//, ""),
       size: obj.Size,