Search filter "No filtered data found" message added + Dropdown close/reopen issue fixed

[ninilo97]

[1]
Shows new placeholder text when no data is found during a search.
Shows :

Instead of

[2]
closeDropdown() is not required in "blur" hostlistener as it is already covered in [clickOutside] ClickOutsideDirective.
Turns out this closeDropdown was causing #198 #295 #302 and #309

Reference:
[1] Pipe filter empty check
[2] YHGxG's comment in issue thread

[ninilo97]

@NileshPatel17 Please review this pull request.

[rooby]

Generally it should be one PR per issue fixed instead of putting multiple unrelated changes in a single PR.
That way it's easier to track and revert changes if required.

Also if you're removing code, like the call to this.closeDropdown(); it should be removed, not commented out.

[rooby]

@NileshPatel17 did you mean to commit that commented out line of code instead of just deleting the line?
It gets messy with commented out code and it's not clear when reading the code why it's there and commented out.

[NileshPatel17]

@rooby agree, will remove it..

[rooby]

@NileshPatel17
I think this also fixed #295

Also, the commented out line is still there in the master branch.