VtkVtpData::get_point_data() fails silently if data is float32

Description

If VtkVtpData::get_point_data(const std::string& data_name) is used to read an array from a VTP file, and the data for that array happens to be stored as a float32 (rather than float64), this function returns an empty array. I consider this a silent failure.

Reproduction

Use this case for reproduction spatially_variable_robin.zip. This is identical to the spatially variable robin test case, except I modified Y0_spatially_varying_robin.vtp to store the Stiffness array as a float32 array. Run this case and get the error

(base) aaronbrown@Aarons-MacBook-Pro-2 spatially_variable_robin % mpirun -np 4 /Users/aaronbrown/GitHub/svMultiPhysics_aabrown100-git/build/svMultiPhysics-build/bin/svmultiphysics solver.xml 
libc++abi: terminating due to uncaught exception of type BoundaryConditionVtpArrayDimensionException: 'Stiffness' array in VTP file 'Y0_spatially_varying_robin.vtp' has incorrect dimensions. Expected 79 x 1, got 0 x 0
[Aarons-MacBook-Pro-2:88409] *** Process received signal ***
[Aarons-MacBook-Pro-2:88409] Signal: Abort trap: 6 (6)
[Aarons-MacBook-Pro-2:88409] Signal code:  (0)
[Aarons-MacBook-Pro-2:88409] [ 0] 0   libsystem_platform.dylib            0x00007ff80555431d _sigtramp + 29
[Aarons-MacBook-Pro-2:88409] [ 1] 0   ???                                 0x00007ff7b186ee48 0x0 + 140701812059720
[Aarons-MacBook-Pro-2:88409] [ 2] 0   libsystem_c.dylib                   0x00007ff80543a5c6 abort + 126
[Aarons-MacBook-Pro-2:88409] [ 3] 0   libc++abi.dylib                     0x00007ff8054d2170 _ZN10__cxxabiv130__aligned_malloc_with_fallbackEm + 0
[Aarons-MacBook-Pro-2:88409] [ 4] 0   libc++abi.dylib                     0x00007ff8054c32d4 _ZL28demangling_terminate_handlerv + 240
[Aarons-MacBook-Pro-2:88409] [ 5] 0   libobjc.A.dylib                     0x00007ff8051462f7 _ZL15_objc_terminatev + 104
[Aarons-MacBook-Pro-2:88409] [ 6] 0   libc++abi.dylib                     0x00007ff8054d15bb _ZSt11__terminatePFvvE + 6
[Aarons-MacBook-Pro-2:88409] [ 7] 0   libc++abi.dylib                     0x00007ff8054d43d2 __cxa_rethrow + 100
[Aarons-MacBook-Pro-2:88409] [ 8] 0   svmultiphysics                      0x000000010e92dff2 _ZN17BoundaryConditionC2ERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEERKNS0_6vectorIS6_NS4_IS6_EEEERKNS0_3mapIS6_bNS0_4lessIS6_EENS4_INS0_4pairIS7_bEEEEEERK8faceTypeR16SimulationLogger + 1042
[Aarons-MacBook-Pro-2:88409] [ 9] 0   svmultiphysics                      0x000000010e85102c _ZN22RobinBoundaryConditionC2ERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEEbRK8faceTypeR16SimulationLogger + 252
[Aarons-MacBook-Pro-2:88409] [10] 0   svmultiphysics                      0x000000010e8351be _ZN13read_files_ns7read_bcEP10SimulationP18EquationParametersR6eqTypeP27BoundaryConditionParametersR6bcType + 6942
[Aarons-MacBook-Pro-2:88409] [11] 0   svmultiphysics                      0x000000010e84886d _ZN13read_files_ns7read_eqEP10SimulationP18EquationParametersR6eqType + 2429
[Aarons-MacBook-Pro-2:88409] [12] 0   svmultiphysics                      0x000000010e84b567 _ZN13read_files_ns10read_filesEP10SimulationRKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEE + 1703
[Aarons-MacBook-Pro-2:88409] [13] 0   svmultiphysics                      0x000000010e7a952f main + 1151
[Aarons-MacBook-Pro-2:88409] [14] 0   dyld                                0x00007ff805176530 start + 3056
[Aarons-MacBook-Pro-2:88409] *** End of error message ***
--------------------------------------------------------------------------
prterun noticed that process rank 0 with PID 88409 on node Aarons-MacBook-Pro-2 exited on
signal 6 (Abort trap: 6).
--------------------------------------------------------------------------

The error doesn't reveal that the issue is the Stiffness data is stored in float32. To figure this out, a user would have to go into source code.

Expected behavior

This function should throw an error saying that it could not cast the data to a double array. Even better, this function should handle multiple data types.

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct and Contributing Guidelines

Start at VtkVtpData::get_point_data(const std::string& data_name) and reproduce the failure with the attached spatially_variable_robin case, using its float32 Stiffness array. Trace why the array becomes empty instead of reporting a cast problem. Done means float32 input no longer fails silently, either by supporting the data type or throwing an informative error.