Add error info to get_cache_header_info and display it to end user

[samirnoman]

when using a git repo, I sometimes encounter the error:

.git_store_meta is malformatted.
Fix it or run --store to create new

And by inspecting the file it's not clear why!
These errors seem like random (I haven't been able to find what causes them)!

So, I made a modification to return a meaningful error from the function get_cache_header_info and display it. This should help disagnose these errors in the future in order to be able to solve them quickly

[danny0838]

1. Please provide the affected file and the recent shell command history when the "random" error happens for further investigation.

2. Please do not include linefeed change in the commits.

[samirnoman]

1. Please provide the affected file and the recent shell command history when the "random" error happens for further investigation.

2. Please do not include linefeed change in the commits.

Unfortunaltely, I don't have an affected file right now. When it happened to me I re-created the file (I should've saved the malformatted file).

Sorry about the linefeeds, I did not pay attention to it because I'm using windows.

[danny0838]

We don't want all the intermediate full-file diffs. Please rebase.

[samirnoman]

the file is already rebased, but it has two commits..
do you mean to squash the two commits?

[samirnoman]

I noticed that the line ending for the intermidiate commit was CRLF. I have corrected that and re-pushed the branch