Fix frame drawing regressions.

Author: HexDecimal

CHANGELOG.rst

@@ -20,6 +20,8 @@ Added
 
 Fixed
  - Contexts now give a more useful error when pickled.
+ - Fixed regressions with `tcod.console_print_frame` and `Console.print_frame`
+   when given empty strings as the banner.
 
 12.2.0 - 2021-04-09
 -------------------

libtcod

@@ -12,7 +12,7 @@
 
 import tcod._internal
 import tcod.constants
-from tcod._internal import deprecate
+from tcod._internal import _check, deprecate
 from tcod.loader import ffi, lib
 
 
@@ -35,6 +35,7 @@ def _fmt(string: str) -> bytes:
 .. versionadded:: 12.3
 """
 
+
 class Console:
     """A console object containing a grid of characters with
     foreground/background colors.
@@ -723,8 +724,10 @@ def print_frame(
         """
         self.__deprecate_defaults("draw_frame", bg_blend)
         string = _fmt(string) if string else ffi.NULL
-        lib.TCOD_console_printf_frame(
-            self.console_c, x, y, width, height, clear, bg_blend, string
+        _check(
+            lib.TCOD_console_printf_frame(
+                self.console_c, x, y, width, height, clear, bg_blend, string
+            )
         )
 
     def blit(

tcod/console.py

@@ -1685,7 +1685,11 @@ def console_print_frame(
         Use :any:`Console.print_frame` instead.
     """
     fmt = _fmt(fmt) if fmt else ffi.NULL
-    lib.TCOD_console_printf_frame(_console(con), x, y, w, h, clear, flag, fmt)
+    _check(
+        lib.TCOD_console_printf_frame(
+            _console(con), x, y, w, h, clear, flag, fmt
+        )
+    )
 
 
 @pending_deprecate()