tui: don't call g_strv_length() on NULL
GLib-CRITICAL **: g_strv_length: assertion `str_array != NULL' failed
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@@ -172,7 +172,7 @@ nmt_address_list_add_clicked (NmtWidgetList *list)
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NmtAddressListPrivate *priv = NMT_ADDRESS_LIST_GET_PRIVATE (list);
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int len;
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len = g_strv_length (priv->strings);
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len = priv->strings ? g_strv_length (priv->strings) : 0;
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priv->strings = g_renew (char *, priv->strings, len + 2);
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priv->strings[len] = g_strdup ("");
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priv->strings[len + 1] = NULL;
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