PO Filter doesn't handle "nplurals=1; plural=0" correctly

The attached file throws an exception in the PO filter, due to incorrect handling of plural forms.

The plural header in this file looks like this:

  "Plural-Forms: nplurals=1; plural=0;\n"

This is valid PO; as the gettext docs read:

Some languages only require one single form. There is no distinction between the singular and plural form. An appropriate header entry would look like this:

Plural-Forms: nplurals=1; plural=0;

However, the POFilter assumes that 2+ plural forms will always be present, even if nplurals=1. This causes an exception when the expected 2nd form is not present.

net.sf.okapi.common.exceptions.OkapiIllegalFilterOperationException: Line 20: Possible missing or invalid plural form of msgstr.
    at net.sf.okapi.filters.po.POFilter.processMsgStr(POFilter.java:592)
    at net.sf.okapi.filters.po.POFilter.readItem(POFilter.java:535)
    at net.sf.okapi.filters.po.POFilter.next(POFilter.java:219)

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