Added check for LogNormal distribution

[ritesh99rakesh]

References to other Issues or PRs

From #17057: When using scipy for sampling from LogNormal distribution, it is giving domain error since one of the tests is using std = 0. But std > 0.

Brief description of what is fixed or changed

Added check condition for positive std.

Other comments

Release Notes

• stats
  • added check condition for LogNormal distribution.

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• stats
  • added check condition for LogNormal distribution. (#17068 by @ritesh99rakesh)

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<!-- Your title above should be a short description of what
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#### References to other Issues or PRs
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From https://github.com/sympy/sympy/pull/17057: When using `scipy` for sampling from `LogNormal` distribution, it is giving domain error since one of the tests is using `std = 0`. But `std > 0`.

#### Brief description of what is fixed or changed
Added check condition for positive `std`.

#### Other comments


#### Release Notes

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<!-- BEGIN RELEASE NOTES -->
- stats
    - added check condition for `LogNormal` distribution.
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Update

The release notes on the wiki have been updated.

[ritesh99rakesh]

Ping @sidhantnagpal

[codecov]

Codecov Report

Merging #17068 into master will increase coverage by 0.012%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##            master    #17068       +/-   ##
=============================================
+ Coverage   74.411%   74.423%   +0.012%     
=============================================
  Files          622       622               
  Lines       160930    160932        +2     
  Branches     37784     37784               
=============================================
+ Hits        119751    119772       +21     
+ Misses       35858     35838       -20     
- Partials      5321      5322        +1

[sidhantnagpal]

Looks fine.