[RFC]: Incomplete code coverage for `blas/ext/base/dnanasumors`

[headlessNode]

See https://coverage.stdlib.io/blas/ext/base/dnanasumors/index.html.

Need to add a test case in each of the relevant test files. The test case should handle the situation where the stride is 0 and the first element is NaN.

For reference see #3051

[stdlib-bot]

👋 Hi there! 👋

And thank you for opening your first issue! We will get back to you shortly. 🏃 💨

[Vishal-Kumar2006]

Test Case for ndarray.js

strideX= 0 and First Element is NaN
Input: N = 4, x = [NaN, 2.0, 3.0, 4.0], strideX = 0, offsetX = 0