Replace assert with warn for no-gaps in `.storage.cli`

Change `assert aids` to a warning log when no history gaps are found
during `ldshm` gap detection; it is the **ideal case** OBVI. This avoids
crashing the CLI when gap detection finds no issues, which is actually
good news!

Bp

(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

piker/storage/cli.py

@@ -447,7 +447,13 @@ def ldshm(
                         )
                         # last chance manual overwrites in REPL
                         # await tractor.pause()
-                        assert aids
+                        if not aids:
+                            log.warning(
+                                f'No gaps were found !?\n'
+                                f'fqme: {fqme!r}\n'
+                                f'timeframe: {period_s!r}\n'
+                                f"WELL THAT'S GOOD NOOZ!\n"
+                            )
                         tf2aids[period_s] = aids
 
                 else: