RuleConverter.wrapInDoubleQuotes : crash in the rules converter

[ameshkov]

Here's how it looks like:

Thread 1 Crashed:
0   libswiftCore.dylib              0x336863840         [inlined] <redacted>
1   libswiftCore.dylib              0x336863840         <redacted>
2   libswiftCore.dylib              0x3368635a4         <redacted>
3   libswiftCore.dylib              0x3368633ac         <redacted>
4   libswiftCore.dylib              0x336862ef4         _assertionFailure
5   libswiftCore.dylib              0x336873c68         String.index
6   AdGuardSdkDependencies          0x104dc4f34         [inlined] String.index
7   AdGuardSdkDependencies          0x104dc4f34         String.subString (StringExtension.swift:109)
8   AdGuardSdkDependencies          0x104dbdf00         RuleConverter.wrapInDoubleQuotes (RuleConverter.swift:431)
9   AdGuardSdkDependencies          0x104dbc590         RuleConverter.convertAbpSnippetRule (RuleConverter.swift:198)
10  AdGuardSdkDependencies          0x104dc1024         [inlined] RuleFactory.converter.unsafeMutableAddressor (RuleFactory.swift:9)
11  AdGuardSdkDependencies          0x104dc1024         RuleFactory.createRules (RuleFactory.swift:28)
12  AdGuardSdkDependencies          0x104daf898         ContentBlockerConverter.convertArray (ContentBlockerConverter.swift:81)
13  SafariAdGuardSDK                0x104cf9b0c         [inlined] ContentBlockerConverterWrapper.convertArray (FiltersConverter.swift:55)
14  SafariAdGuardSDK                0x104cf9b0c         FiltersConverter.convert (FiltersConverter.swift:186)
15  SafariAdGuardSDK                0x104cfb514         [inlined] @callee_guaranteed
16  SafariAdGuardSDK                0x104cfb514         @callee_guaranteed
17  SafariAdGuardSDK                0x104cfa3e0         [inlined] _NativeDictionary._values.getter
18  SafariAdGuardSDK                0x104cfa3e0         [inlined] Dictionary.subscript.getter
19  SafariAdGuardSDK                0x104cfa3e0         Dictionary.concurrentMap<T>
20  libswiftDispatch.dylib          0x3614ba7f0         <redacted>
21  libswiftDispatch.dylib          0x3614be3b0         <redacted>
22  libdispatch.dylib               0x32cd09a6c         <redacted>
23  libdispatch.dylib               0x32cd1d1bc         <redacted>
24  libdispatch.dylib               0x32cd09a2c         <redacted>
25  libdispatch.dylib               0x32cd1b280         <redacted>
26  libdispatch.dylib               0x32cd1b96c         <redacted>
27  libsystem_pthread.dylib         0x41114b104         _pthread_wqthread