Add a change to be removed when answer changes are allowed that set mapalgo to none, when meshfile for c14 is none, and add the missing Advance call to C13Streams that caused problems in PR #3634 where cmip7 Ciso is used

Author: ekluzek

src/biogeochem/CNCIsoAtmTimeSeriesReadMod.F90

@@ -570,6 +570,8 @@ subroutine C14StreamsInit( bounds )
     ! Any error checking
     call shr_assert( trim(stream_mapalgo_atm_c14) == "nn", "stream_mapalgo_atm_c14 MUST be nn because the file " // &
                      "is lattitude bands copied to a half degree grid: "//errMsg( file=sourcefile, line=__LINE__) )
+    ! TODO: Remove the following line once we can change answers
+    if ( trim(stream_meshfile_atm_c14) == "none") ) stream_mapalgo_atm_c14 = "none"
     ! Streams method
     call atm_c14_stream%Init( bounds, &
         fldfilename=stream_fldfilename_atm_c14, &
@@ -696,6 +698,7 @@ subroutine C13Streams( bounds )
     ! !LOCAL VARIABLES:
     integer :: g   ! Indices
 
+    call atm_c13_stream%Advance( bounds)
     call atm_c13_stream%Interp( bounds)
 
     do g = bounds%begg, bounds%endg