Catch connection errors

src/sbeam.py

@@ -102,8 +102,8 @@ def receive(host, destination):
                 fullpath = os.path.join(destination, filepath[1:])
                 os.makedirs(fullpath, exist_ok=True)
                 with open(os.path.join(fullpath, filename), 'wb') as fd:
-                    # TODO split filesize in chunks with remainder
                     fd.write(response.raw.read(int(filesize)))
+            bar.update(len(filelist))
 
 
 @cli.command()
@@ -153,4 +153,7 @@ def tui():
 
 
 if __name__ == '__main__':
-    cli()
+    try:
+        cli()
+    except requests.exceptions.ConnectionError as conerr:
+        print(f'Failed to connect. Target alive?')