Fix #7265 fatal error with 3.18.1.2

[Khadreal]

Description

Fixed fatal error with 3.18.2

Fixes #7265

Type of change

• Bug fix (non-breaking change which fixes an issue).

Detailed scenario

Create a template that doesn't have a closing </body> tag

Technical description

Check if the closing body tag is present and if not, add the script to the html

Documentation

Mandatory Checklist

Code validation

• I validated all the Acceptance Criteria. If possible, provide screenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.
• I implemented built-in tests to cover the new/changed code.

Code style

• I wrote a self-explanatory code about what it does.
• I protected entry points against unexpected inputs.
• I did not introduce unnecessary complexity.
• Output messages (errors, notices, logs) are explicit enough for users to understand the issue and are actionnable.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -0.10%)	✅ 100.00% (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (910100e)	38785	17155	44.23%
Head commit (3000c7f)	38787 (+2)	17157 (+2)	44.23% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#7267)	3	3	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[Mai-Saad]

@Khadreal Thanks for the pr, working fine now.
on PR
(no fatal error)
page with double body => script injected, lrc applied to 1st body, lcp applied
page with no body at all => script injected, lcp applied, lrc not applied "no hashes added"
page with no body closure => no script injected
normal page => beacon injected , lrc/lcp applied
testrail-report-692.pdf
on 3.18.1.1
(fatal is there)
page with double body => script injected once, hashes added to 1st body, lcp/lrc applied
page with no body at all => no script injected
page with no body closure => no script injected
normal page => script injected , lrc applied, lcp no applied (for 2021 but lcp is there on 2020)

updated note on PR (no fatal)
with space in body and html tag => beacon isnot injected
space in body => beacon injected after html
Body => beacon injected after html

on 3.18=> beacon wasn't injected in these cases, for Body hashes added while no beacon