testing, docs: guard test env-var set_property, rename legacy ref, fix docs indent

- Added a guard in testing.cmake before setting the
  `OIIO_OPENEXR_LJ2K_ZSTD_SUPPORT` env variable property for the
  `openexr-compression` test. To fix openImageIO from not being able to
  configure and build when the `BUILD_TESTING`, `OIIO_BUILD_TESTS` flag
  options were not set to `ON`.

Signed-off-by: Abhirup Bhattacharyya <abhirup27022001@outlook.com>

Author: QuantaDude

src/cmake/testing.cmake

@@ -473,10 +473,14 @@ macro (oiio_add_all_tests)
     # New compression tests of zstd and lj2k require OpenEXR main branch,
     # or latest release or at least V3.5.0
     if (OpenEXR_VERSION VERSION_GREATER_EQUAL 3.5.0)
-        set_property (TEST openexr-compression APPEND PROPERTY ENVIRONMENT
-                      "OIIO_OPENEXR_LJ2K_ZSTD_SUPPORT=1")
-        set_property (TEST openexr-compression.core APPEND PROPERTY ENVIRONMENT
-                      "OIIO_OPENEXR_LJ2K_ZSTD_SUPPORT=1")
+        if (TEST openexr-compression)
+            set_property (TEST openexr-compression APPEND PROPERTY ENVIRONMENT
+                          "OIIO_OPENEXR_LJ2K_ZSTD_SUPPORT=1")
+        endif ()
+        if (TEST openexr-compression.core)
+            set_property (TEST openexr-compression.core APPEND PROPERTY 
+                          ENVIRONMENT "OIIO_OPENEXR_LJ2K_ZSTD_SUPPORT=1")
+        endif ()
     endif ()
 
     # Regression test (compiles its own helper and generates its own image)

src/doc/builtinplugins.md

@@ -1612,7 +1612,7 @@ The official OpenEXR site is <http://www.openexr.com/>.
    * - ``FNumber``
      - float
      - aperture
-  * - ``compression``
+   * - ``compression``
      - string
      - one of: ``"none"``, ``"rle"``, ``"zip"``, ``"zips"``, ``"piz"``,
        ``"pxr24"``, ``"b44"``, ``"b44a"``, ``"dwaa"``, ``"dwab"``,