Merge pull request #447 from ryanseys/check-config-obj

Check config object exists before getting firstChunk

Author: stephenplusplus

lib/storage/file.js

@@ -1024,7 +1024,7 @@ File.prototype.startResumableUpload_ = function(stream, metadata) {
       // by caching a slice of the first chunk, then comparing it with the first
       // byte of incoming data.
       if (bytesWritten === 0) {
-        var cachedFirstChunk = configStore.get(that.name).firstChunk;
+        var cachedFirstChunk = config && config.firstChunk;
         var firstChunk = chunk.slice(0, 16);
 
         if (!cachedFirstChunk) {