fix(datepicker): fixed error while cleaning input for daterangepicker

[SvetlanaMuravlova]

fixed error while cleaning input for daterangepicker
close #6372

[github-actions]

Visit the preview URL for this PR (updated for commit 065b422):

https://ngx-bootstrap-demo--pr6407-daterangepicker-erro-ew14afq4.web.app

_{(expires Wed, 19 Jan 2022 12:06:24 GMT)}

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[codecov]

Codecov Report

Merging #6407 (065b422) into development (12e050f) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development    #6407   +/-   ##
============================================
  Coverage        75.81%   75.81%           
============================================
  Files              315      315           
  Lines            10608    10608           
  Branches          2930     2931    +1     
============================================
  Hits              8042     8042           
  Misses            2565     2565           
  Partials             1        1           

Impacted Files	Coverage Δ
src/datepicker/reducer/bs-datepicker.reducer.ts	70.13% <100.00%> (ø)

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[cypress]

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Test summary

744 • 88 • 14 • 0

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Run details

Project	ngx-bootstrap
Status	Failed
Commit	3df1846 ℹ️
Started	Jan 12, 2022 12:07 PM
Ended	Jan 12, 2022 12:41 PM
Duration	34:39 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 93

View run in Cypress Dashboard ➡️

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Failures

	typeahead_page_spec.ts		1
1	Typeahead demo page testing suite > On blur > clicking anywhere outside auto-fills "Option on blur" with the first option from the matches list
	datepicker/locales_spec.ts		2
1	Datepicker demo testing suite: Locales > Change Locale Datepicker > when user chose locale es-pr for "Datepicker", container shown in appropriate language
2	Datepicker demo testing suite: Locales > Change Locale DateRangepicker > when user chose locale es-pr for "Daterangepicker", container shown in this language
	pagination_page_spec.ts		7
1	Pagination demo page testing suite > Page changed event > when user click on "Next" button, "Page changed to: 2" shown
2	Pagination demo page testing suite > Page changed event > when user click on "Previous" button, "Page changed to: 1" shown
3	Pagination demo page testing suite > Pages count changed event > when user click on "Next" button, "The selected page no: 2/9" shown
4	Pagination demo page testing suite > Pages count changed event > when user click on "Previous" button, "The selected page no: 1/9" shown
5	Pagination demo page testing suite > Boundary links > when user click on "Last", 6 - active, 1 - inactive, "Next/Last"-disabled, "First/Previous"-enabled
6	Pagination demo page testing suite > Boundary links > when user click on First, 1 - active, 6 - inactive, "Next/Last"- enabled, First/Previous - disabled
7	Pagination demo page testing suite > Boundary links > when user click on "Hide/show boundary links", "First" and "Last" buttons are disappeared
This comment includes only the first 10 test failures. See all 88 failures in the Cypress Dashboard.

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