glance methods always return either a one-row data frame, or NULL

1 2 | ```
## S3 method for class 'timedist'
glance(x, ...)
``` |

`x` |
An object of class |

`...` |
Additional arguments (not used). |

`glance`

returns one row with the columns

`sigma` |
the square root of the estimated residual variance |

`isConv` |
whether the fit successfully converged |

`finTol` |
the achieved convergence tolerance |

`logLik` |
the data's log-likelihood under the model |

`AIC` |
the Akaike Information Criterion |

`BIC` |
the Bayesian Information Criterion |

`deviance` |
deviance |

`df.residual` |
residual degrees of freedom |

`RSS` |
corrected residual sum of squares |

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