[Bug]: LogFormatter minor ticks with `minor_thresholds` of (0,0) does not behave as documented

A pull request for this has already been merged.

• #29698 by @anntzer — merged

### Bug summary

In investigating #25894 I discovered that despite being documented as:

> To disable labeling of minor ticks when 'labelOnlyBase' is False, use `minor_thresholds=(0, 0)`. This is the default for the "classic" style.

It actually only removes some minor tick labels (e.g. with base of 10: 11-14 will get labels, but 16-19 (15 is edge case, dependent on floating point rounding, 1.4, or 140 also similar))

### Code for reproduction

```python
import matplotlib.pyplot as plt
import matplotlib.ticker as mticker

fig, ax = plt.subplots()
ax.set_yscale("log")

formatter = mticker.LogFormatter(minor_thresholds=(0,0))
ax.yaxis.set_minor_formatter(formatter)

ax.set_ylim(10, 20)
plt.show()
```

### Actual outcome


```python
formatter(10) # '10'
formatter(11) # '11'
formatter(12) # '12'
formatter(13) # '13'
formatter(14) # '14'
formatter(15) # '15'
formatter(16) # ''
```

### Expected outcome


```python
formatter(10) # ''
formatter(11) # ''
formatter(12) # ''
formatter(13) # ''
formatter(14) # ''
formatter(15) # ''
formatter(16) # ''
```

### Additional information

Only really affects plots that are zoomed in to much less than one decade, which arguably doesn't make sense to use a log scale, but still seems incongruous with the documented "this turns off minor ticks".

Has to do with when `coeff` rounds down to `1` in:

https://github.com/matplotlib/matplotlib/blob/f051d9449820b5e7c01dcc1361d161517bff179f/lib/matplotlib/ticker.py#L980-L988

I'm not _quite_ sure what the proper solution is, perhaps making `self._sublabels=set()` instead?

### Operating system

Linux

### Matplotlib Version

3.8 (main)

### Matplotlib Backend

_No response_

### Python version

3.11

### Jupyter version

_No response_

### Installation

git checkout

Start in lib/matplotlib/ticker.py at the linked lines around 980-988 and reproduce the behavior with LogFormatter(minor_thresholds=(0, 0)) using the example and formatter calls in the issue. The work is done when minor tick labels are consistently empty for this setting, including the zoomed-in range described.

Written by the indexing model from the issue text.