don't crash on stalls

impatient

@@ -3,6 +3,7 @@
 import argparse
 import datetime
 import subprocess
+import sys
 import time
 
 WINDOW_SIZE = 100
@@ -72,18 +73,19 @@ while True:
     rate = (current - samples[0])/((len(samples)-1)*args.interval)
 
     print('\033[2K\r', end='')
-    print('{} - {}/s'.format(display_value(current), display_value(rate)), end='', flush=True)
+    print('{} - {}/s'.format(display_value(current), display_value(rate)), end='')
     if final:
         fraction = current / final
         value_remaining = final - current
+        print(' - {} total - {:.1f}% complete'.format(display_value(final), 100*fraction), end='')
+        if rate > 0:
             time_remaining = datetime.timedelta(seconds=(value_remaining / rate))
             eta = datetime.datetime.now() + time_remaining
-        print(' - {} total - {:.1f}% complete - {} remaining - ETA {}'.format(
-            display_value(final),
-            100*fraction,
+            print(' - {} remaining - ETA {}'.format(
                 display_timedelta(time_remaining),
                 eta.isoformat(sep=' ', timespec='minutes'),
-        ), end='', flush=True)
+            ), end='')
+    sys.stdout.flush()
 
     if final and current >= final:
         print()