PVS-Studio warning V517 for ICU

UnicodeString&
MessageFormat::toPattern(UnicodeString& appendTo) const {
  ...
  else if (formatAlias == *defaultTimeTemplate) {
    appendTo += ID_TIME;
  }
  ...
  else if (formatAlias == *defaultTimeTemplate) {
    appendTo += ID_TIME;
    appendTo += COMMA;
    appendTo += ID_MEDIUM;
  }
  ...
}

This suspicious code was found in ICU project by PVS-Studio static code analyzer.
Warning message is:
V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 800, 808. icui18n msgfmt.cpp 800

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