fix(tmux_cmd): remove only trailing new lines in stdout

Author: rockandska

libtmux/common.py

@@ -270,16 +270,21 @@ def __init__(self, *args: t.Any, **kwargs: t.Any) -> None:
 
         stdout_str = console_to_str(stdout)
         stdout_split = stdout_str.split("\n")
-        stdout_filtered = list(filter(None, stdout_split))  # filter empty values
+        # remove trailing newlines from stdout
+        for i in range(len(stdout_split)-1, -1, -1):
+            if stdout_split[i] == '':
+                stdout_split.pop(i)
+            else:
+                break
 
         stderr_str = console_to_str(stderr)
         stderr_split = stderr_str.split("\n")
         self.stderr = list(filter(None, stderr_split))  # filter empty values
 
-        if "has-session" in cmd and len(self.stderr) and not stdout_filtered:
+        if "has-session" in cmd and len(self.stderr) and not stdout_split:
             self.stdout = [self.stderr[0]]
         else:
-            self.stdout = stdout_filtered
+            self.stdout = stdout_split
 
         logger.debug("self.stdout for {}: \n{}".format(" ".join(cmd), self.stdout))