Check if form calls IsSubmitted

[mabumusa1]

Q	A
Branch?	"features"
Bug fix?	yes
New feature?	no
Deprecations?	no
BC breaks?	no
Automated tests included?	yes/no
Related user documentation PR URL	mautic/mautic-documentation#...
Related developer documentation PR URL	mautic/developer-documentation#...
Issue(s) addressed	Fixes #9826

Description:

Steps to test this PR:

1. Load up this PR

[RCheesley]

Confirmed the bug before applying the PR - 500 error. After applying the PR I was able to merge the two companies without an error and the contacts are correctly assigned to the company as a result. Thanks @mabumusa1 ! 🚀 🎉

[codecov]

Codecov Report

Merging #9847 (fc81f71) into features (cf0cd31) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             features    #9847   +/-   ##
===========================================
  Coverage       39.77%   39.77%           
- Complexity      34196    34197    +1     
===========================================
  Files            2017     2017           
  Lines          106372   106372           
===========================================
  Hits            42313    42313           
  Misses          64059    64059           

Impacted Files	Coverage Δ	Complexity Δ
...s/CoreBundle/Controller/AbstractFormController.php	9.00% <100.00%> (ø)	33.00 <0.00> (+1.00)

[escopecz]

Thanks! 👍

[RCheesley]

@all-contributors add mabumusa1 for code

[allcontributors]

@RCheesley

This project's configuration file has malformed JSON: .all-contributorsrc. Error:: Unexpected token : in JSON at position 325

[RCheesley]

@all-contributors add mabumusa1 for code

[allcontributors]

@RCheesley

This project's configuration file has malformed JSON: .all-contributorsrc. Error:: Unexpected token : in JSON at position 355

[RCheesley]

@all-contributors add @mabumusa1 for code

[allcontributors]

@RCheesley

This project's configuration file has malformed JSON: .all-contributorsrc. Error:: Unexpected token : in JSON at position 355

[RCheesley]

@all-contributors add @mabumusa1 for code

[allcontributors]

@RCheesley

This project's configuration file has malformed JSON: .all-contributorsrc. Error:: Unexpected token { in JSON at position 358

[RCheesley]

@all-contributors add @mabumusa1 for code

[allcontributors]

@RCheesley

I've put up a pull request to add @mabumusa1! 🎉