fix some errors to get it working with php7.0 #21
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Just a few fixes to get it running on php7. The try-block was necessary as my radio (SilverCrest) does not support some nodes (netRemote.sys.net.wlan.setFccTestChanNum, netRemote.sys.net.wlan.setFccTestDataRate, netRemote.sys.net.wlan.setFccTestTxDataPattern, netRemote.sys.net.wlan.setFccTestTxPower) which blocked the UI with an exception.