EB: don't abort for no-op case in unsupported addFineLevels functions (…

…#4123)

## Summary

The `addFineLevels` function is not supported for EB2 for chk_file and
stl geometries. However, it may be called in some for some trivial cases
where it is adding 0 levels, in which case it is a no-op. There is no
reason to abort in those cases.

## Additional background

For PeleC, a work-around was put in to not call the function in the
trivial cases (AMReX-Combustion/PeleC#771). I
was thinking about adding the same work around to address the same thing
in PeleLMeX (AMReX-Combustion/PeleLMeX#407),
but maybe it would be better to simply allow the function to be called
in trivial cases. If there's a reason not to do this, I'll just put the
workaround in for PeleLMeX.

Src/EB/AMReX_EB2_IndexSpace_STL.cpp

@@ -83,9 +83,12 @@ IndexSpaceSTL::getGeometry (const Box& dom) const
 }
 
 void
-IndexSpaceSTL::addFineLevels (int /*num_new_fine_levels*/)
+IndexSpaceSTL::addFineLevels (int num_new_fine_levels)
 {
-    amrex::Abort("IndexSpaceSTL::addFineLevels: todo");
+    // This function is a no op if not adding levels, otherwise TODO
+    if (num_new_fine_levels > 0) {
+        amrex::Abort("IndexSpaceSTL::addFineLevels: todo");
+    }
 }
 
 void

Src/EB/AMReX_EB2_IndexSpace_chkpt_file.cpp

@@ -78,9 +78,12 @@ IndexSpaceChkptFile::getGeometry (const Box& dom) const
 }
 
 void
-IndexSpaceChkptFile::addFineLevels (int /*num_new_fine_levels*/)
+IndexSpaceChkptFile::addFineLevels (int num_new_fine_levels)
 {
-    amrex::Abort("IndexSpaceChkptFile::addFineLevels: not supported");
+    // This function is a no op if not adding levels, otherwise TODO
+    if (num_new_fine_levels > 0) {
+        amrex::Abort("IndexSpaceChkptFile::addFineLevels: not supported");
+    }
 }
 
 void