Fix empty-df detection and date ordering

Author: ValueRaider

yfinance/multi.py

@@ -145,15 +145,15 @@ def download(tickers, start=None, end=None, actions=False, threads=True, ignore_
 
     if ignore_tz:
         for tkr in shared._DFS.keys():
-            if not shared._DFS[tkr] is None:
+            if (shared._DFS[tkr] is not None) and (shared._DFS[tkr].shape[0]>0):
                 shared._DFS[tkr].index = shared._DFS[tkr].index.tz_localize(None)
 
     try:
-        data = _pd.concat(shared._DFS.values(), axis=1,
+        data = _pd.concat(shared._DFS.values(), axis=1, sort=True,
                           keys=shared._DFS.keys())
     except Exception:
         _realign_dfs()
-        data = _pd.concat(shared._DFS.values(), axis=1,
+        data = _pd.concat(shared._DFS.values(), axis=1, sort=True,
                           keys=shared._DFS.keys())
 
     # switch names back to isins if applicable