Preview: When Reaction Conditions text field is empty, clicking on placeholder text on canvas results in a blank line, with no visible text

[Zhirnoff]

Steps to Reproduce

1. Copy and Paste on canvas

$RDFILE 1
$DATM    11/05/24 13:20
$RFMT
$RXN

 -INDIGO- 1105241320

  2  1
$MOL

  -INDIGO-11052413202D

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M  END
$MOL

  -INDIGO-11052413202D

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   10.9766   -9.0750    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   11.8402  -10.5755    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   10.1098  -10.5800    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
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$MOL

  -INDIGO-11052413202D

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   14.0348   -8.5251    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   15.7652   -8.5246    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
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   14.9038  -10.0250    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
  3  1  2  0  0  0  0
  1  5  1  0  0  0  0
  5  6  2  0  0  0  0
  6  4  1  0  0  0  0
  4  2  2  0  0  0  0
  2  3  1  0  0  0  0
M  END
$DTYPE Name
$DATUM Asderwydfgewsghdjedghdfertsdfg
$DTYPE Reference
$DATUM Not available
$DTYPE Reaction Conditions
$DATUM  

Actual behavior
When 'Reaction Conditions text' field is empty, clicking on placeholder text on canvas results in a blank line, with no visible text

Expected behavior
If the 'Reaction Conditions text' field is empty, either no placeholder should appear on the canvas

Screenshot

Desktop:

• OS: Windows 11
• Browser Chrome
• Version 128.0.6613.120 (Official Build) (64-bit)

Ketcher version
[Version 2.26.0-rc.7]
Indigo version
[Version 1.27.0-dev.1]

Bug foun while pre-testing: #2559

[ivanmaslow]

The fix is verified on on CI-CD SA environment with Ketcher-Master, Indigo-2404-ket-to-rdf branches:

• Ketcher [Version 2.28.0-dev.1] Build at 2024-11-20; 09:14:36
• Indigo Version 1.27.0-dev.1.38-g6c821972-wasm32-wasm-clang-12.0.0
• Desktop, Windows 11 Enterprise
• Chrome Version 131.0.6778.70 (Official Build) (64-bit)

No additional new lines are added in this case: