Text nodes lose after save to SVG

[evgeniiFrolov1]

Steps to Reproduce

1. run Ketcher
2. load structure from an attached file.
3. click to save
4. select file format "SVG Document"

Expected behavior
Structure saves as is.

Actual behavior
Structure saves without any text nodes

Screenshots

for SA

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Ketcher version
2.5.2

Additional context
Add any other context about the problem here.

[evgeniiFrolov1]

{
"root": {
"nodes": [
{
"$ref": "mol0"
},
{
"$ref": "mol1"
},
{
"type": "arrow",
"data": {
"mode": "open-angle",
"pos": [
{
"x": 10.049999999999999,
"y": -2.449999999999999,
"z": 0
},
{
"x": 12.05,
"y": -2.449999999999999,
"z": 0
}
]
}
},
{
"type": "text",
"data": {
"content": "{"blocks":[{"key":"6ehda","text":"100 ℃","type":"unstyled","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}}],"entityMap":{}}",
"position": {
"x": 10.475,
"y": -1.7999999999999994,
"z": 0
}
}
}
]
},
"mol0": {
"type": "molecule",
"atoms": [
{
"label": "O",
"location": [
13.049999904632568,
-2.3749999999999996,
0
]
}
],
"stereoFlagPosition": {
"x": 13.049999904632568,
"y": 1.3750000000000004,
"z": 0
}
},
"mol1": {
"type": "molecule",
"atoms": [
{
"label": "O",
"location": [
7.85,
-2.3749999999999996,
0
]
},
{
"label": "O",
"location": [
8.85,
-2.3749999999999996,
0
]
}
],
"bonds": [
{
"type": 1,
"atoms": [
0,
1
]
}
],
"stereoFlagPosition": {
"x": 10.475,
"y": 0.7999999999999994,
"z": 0
}
}
}

[evgeniiFrolov1]

fixed in 1.8 epam/Indigo#619