fix: add a check that the href attribute exists in link params

Author: IvanIhnatsiuk

ios/inputParser/InputParser.mm

@@ -597,10 +597,12 @@ - (NSArray *)getTextAndStylesFromHtml:(NSString *)fixedHtml {
     } else if([tagName isEqualToString:@"code"]) {
       [styleArr addObject:@([InlineCodeStyle getStyleType])];
     } else if([tagName isEqualToString:@"a"]) {
-      [styleArr addObject:@([LinkStyle getStyleType])];
-      // cut only the url from the href="..." string
-      NSString *url = [params substringWithRange:NSMakeRange(6, params.length - 7)];
-      stylePair.styleValue = url;
+       [styleArr addObject:@([LinkStyle getStyleType])];
+       NSRange hrefRange = [params rangeOfString:@"href="];
+       if(hrefRange.location != NSNotFound) {
+         NSString *url = [params substringWithRange:NSMakeRange(6, params.length - 7)];
+         stylePair.styleValue = url;
+       }
     } else if([tagName isEqualToString:@"mention"]) {
       [styleArr addObject:@([MentionStyle getStyleType])];
       // extract html expression into dict using some regex