ccmlib/node: run_sstable2json to handle non-exist files

seems like introducing of raising failure on any failure
of sstabledump has started to fail some dtests
since it was used in some places right after compation
and some of the sstable were deleted between listing them
to using them with sstable dump, so we need to ignore
failures from non existing files.

ccmlib/node.py

@@ -985,7 +985,10 @@ def run_sstable2json(self, out_file=None, keyspace=None, datafiles=None, column_
             args = sstable2json + [sstablefile]
             if enumerate_keys:
                 args = args + ["-e"]
-            res = subprocess.run(args, env=env, stdout=out_file, text=True, check=True)
+            res = subprocess.run(args, env=env, stdout=out_file, stderr=subprocess.PIPE, text=True)
+            if not res.returncode == 0 and "Cannot find file" not in res.stderr:
+                common.print_if_standalone(res.stderr, debug_callback=self.info, end='')
+                raise ToolError(args, exit_status=res.returncode, stdout=res.stdout, stderr=res.stderr)
             common.print_if_standalone(res.stdout if res.stdout else '', debug_callback=self.info, end='')
 
     def run_json2sstable(self, in_file, ks, cf, keyspace=None, datafiles=None, column_families=None, enumerate_keys=False):