bpls does not show string variable's value in bpls -l

[pnorbert]

$ bpls -l test-out.bp/
  int32_t  int     scalar = 42
  double   real    scalar = 3.1415
  string   string  scalar = ""

$ ctest -R Engine.BP.BPWriteReadTestADIOS2.ADIOS2BPWriteRead1D8.BP4.Serial
Test project /home/adios/ADIOS2/build.debug
    Start 204: Engine.BP.BPWriteReadTestADIOS2.ADIOS2BPWriteRead1D8.BP4.Serial
1/1 Test #204: Engine.BP.BPWriteReadTestADIOS2.ADIOS2BPWriteRead1D8.BP4.Serial ...   Passed    0.43 sec

100% tests passed, 0 tests failed out of 1

Total Test time (real) =   0.46 sec
adios@PC0136094:~/ADIOS2/build.debug$ bpls -l testing/adios2/engine/bp/bp4/ADIOS2BPWriteRead1D8.bp
  char      ch       3*{8} = B / z
  int16_t   i16      3*{8} = -509 / 522
  int32_t   i32      3*{8} = -131069 / 131082
  int64_t   i64      3*{8} = -8589934589 / 8589934602
  int8_t    i8       3*{8} = -5 / 10
  string    iString  3*scalar = "" / ""
  float     r32      3*{8} = 1.1 / 10.1
  double    r64      3*{8} = 11.2 / 20.2
  uint16_t  u16      3*{8} = 32769 / 32778
  uint32_t  u32      3*{8} = 2147483649 / 2147483658
  uint64_t  u64      3*{8} = 9223372036854775809 / 9223372036854775818
  uint8_t   u8       3*{8} = 129 / 138
adios@PC0136094:~/ADIOS2/build.debug$ bpls -l testing/adios2/engine/bp/bp4/ADIOS2BPWriteRead1D8.bp -d iString
  string    iString  3*scalar = "" / ""
    (0)    "Testing ADIOS2 String type" "Testing ADIOS2 String type" "Testing ADIOS2 String type"

adios@PC0136094:~/ADIOS2/build.debug$ bpls -l testing/adios2/engine/bp/bp4/ADIOS2BPWriteRead1D8.bp -D iString
  string    iString  3*scalar = "" / ""
        step 0:  = "Testing ADIOS2 String type"
        step 1:  = "Testing ADIOS2 String type"
        step 2:  = "Testing ADIOS2 String type"

[pnorbert]

fixed by #3805