Fix line callbacks not firing when no filter_lines set

The line buffering and callback processing only ran when a filter
pattern was configured. Enter the line processing branch whenever
line_callbacks are registered too.

esphome/util.py

@@ -162,7 +162,7 @@ class RedirectText:
         if not isinstance(s, str):
             s = s.decode()
 
-        if self._filter_pattern is not None:
+        if self._filter_pattern is not None or self._line_callbacks:
             self._line_buffer += s
             lines = self._line_buffer.splitlines(True)
             for line in lines:
@@ -174,7 +174,10 @@ class RedirectText:
 
                 line_without_ansi = ANSI_ESCAPE.sub("", line)
                 line_without_end = line_without_ansi.rstrip()
-                if self._filter_pattern.match(line_without_end) is not None:
+                if (
+                    self._filter_pattern is not None
+                    and self._filter_pattern.match(line_without_end) is not None
+                ):
                     # Filter pattern matched, ignore the line
                     continue