Fix line stripping edge case for %load magic command (ipython#14495)

Closes: ipython#14494

Author: Carreau

IPython/core/magics/code.py

@@ -153,7 +153,9 @@ def strip_initial_indent(lines):
 
         for line in it:
             if line.startswith(indent):
-                yield line[len(indent):]
+                yield line[len(indent) :]
+            elif line in ("\n", "\r\n") or len(line) == 0:
+                yield line
             else:
                 # Less indented than the first line - stop dedenting
                 yield line