Fix invalid assert.throws statements

[igonro]

Closes #416.

• Fix invalid assert.throws statements
• Run the tests again and check that the tests passed

To review: @risenW @steveoni

[igonro]

After fixing the invalid assert.throws, some of the node tests are not passing. This is the output:

  707 passing (965ms)
  2 failing

  1) DataFrame
       addColumn
         throw error for wrong column length:

      AssertionError: expected [Function] to throw error including 'ParamError: Column data length mismatch. You provided data with length 3 but Ndframe has column of length 4' but got 'ParamError: Column data length mismatch. You provided data with length 3 but Ndframe has column of length 3'
      + expected - actual

      -ParamError: Column data length mismatch. You provided data with length 3 but Ndframe has column of length 3
      +ParamError: Column data length mismatch. You provided data with length 3 but Ndframe has column of length 4

      at Context.<anonymous> (test/core/frame.test.ts:131:20)
      at processImmediate (internal/timers.js:464:21)

  2) Generic (NDFrame)
       NDframe Created from Array
         Throws error on duplicate index:

      AssertionError: expected [Function] to throw error including 'IndexError: Row index must contain unique values' but got 'IndexError: You provided an index of length 3 but Ndframe rows has length of 2'
      + expected - actual

      -IndexError: You provided an index of length 3 but Ndframe rows has length of 2
      +IndexError: Row index must contain unique values

      at Context.<anonymous> (test/core/generic.test.ts:72:20)
      at processImmediate (internal/timers.js:464:21)

[igonro]

The same happens for some browser tests:

Chrome Headless 98.0.4758.102 (Linux x86_64) DataFrame addColumn throw error for wrong column length FAILED
        AssertionError: expected [Function] to throw error including 'ParamError: Column data length mismatch. You provided data with length 3 but Ndframe has column of length 4' but got 'ParamError: Column data length mismatch. You provided data with length 3 but Ndframe has column of length 3'
            at Context.<anonymous> (/tmp/7ad0f53a5cff4b52986a8d5fc061a919.browserify.js:151280:14)

Chrome Headless 98.0.4758.102 (Linux x86_64) Generic (NDFrame) NDframe Created from Array Throws error on duplicate index FAILED
        AssertionError: expected [Function] to throw error including 'IndexError: Row index must contain unique values' but got 'IndexError: You provided an index of length 3 but Ndframe rows has length of 2'
            at Context.<anonymous> (/tmp/7ad0f53a5cff4b52986a8d5fc061a919.browserify.js:154123:14)

[igonro]

I solved those errors. Now all the tests are passing! 🎉

I'm glad I casually found those assert.throws typos while working in #417, because they were hiding a little bug in the shared/errors.ts file, and other little bug in the tests of "Throws error on duplicate index" 😄

[igonro]

Done! @steveoni
I did it for the js files. Maybe is needed for the ts files too(?)
I looked at some assert.throws, but the lint style is a bit different sometimes.