QMCPACK does not abort when XML includes are misssing

[prckent]

Running the oxygen atom lab 2, with unmodified example input, should generate an abort. Instead a SEGV occurs. The "I/O warning" should abort but does not.

pwd
/home/ ... /qmcpack/labs/lab2_qmc_basics/oxygen_atom
../../../../build_intel2018/bin/qmcpack O.q0.opt.in.xml

Random Number
 -------------
  Offset for the random number seeds based on time: 20

  Range of prime numbers to use as seeds over processors and threads = 79-199

I/O warning : failed to load external entity "PTCL_XML"
ERROR File PTCL_XML is invalid
ERROR ERROR: No target particle e exists.
I/O warning : failed to load external entity "���"
ERROR File ��� is invalid
Segmentation fault