Update Talawa to give a meaningful message if the URL isn't available.

[Ayush0Chaudhary]

Is your feature request related to a problem? Please describe.
When I started the app and followed the setup documentation I ran into this problem, Only got to know about it after I checked out community slack

Describe the solution you'd like
Give proper error messages when URl isn't available

Describe alternatives you've considered
Give error message

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[Ayush0Chaudhary]

@palisadoes please assign it to me, I'll complete this issue

[Ayush0Chaudhary]

talawa/lib/widgets/organization_list.dart

Lines 34 to 51 in 46cf4ef

	if (result.hasException) {
	final isException = databaseFunctions.encounteredExceptionOrError(
	result.exception!,
	showSnackBar: false,
	);
	if (isException != null) {
	if (isException) {
	refetch!();
	} else {
	refetch!();
	}
	}
	} else {
	if (!result.isLoading) {
	model.organizations = OrgInfo().fromJsonToList(
	result.data!['organizationsConnection'] as List,
	);
	}

I went through the code and I think issue exists here.

If we set showSnackBar = true
the code will try to show SnackBar while building the screen, thus throwing a error.
Am I going in right direction @palisadoes @SiddheshKukade ??

[Ayush0Chaudhary]

Hi, @palisadoes I implemented the solution, can you review it??
Please suggest changes if any required...
Ayush0Chaudhary@c22d593

[palisadoes]

@Ayush0Chaudhary Please open a pull request against this repo

[Ayush0Chaudhary]

I opened the PR against this issue but later was asked to change the PR title
@palisadoes

[Ayush0Chaudhary]

#1380

Here is the link to PR @palisadoes