reset command for each run invocation

Author: guoqiao1992

src/sagemaker/spark/processing.py

@@ -206,6 +206,7 @@ def run(
                 user code file (default: None).
         """
         self._current_job_name = self._generate_current_job_name(job_name=job_name)
+        self.command = []
 
         super().run(
             submit_app,
@@ -737,6 +738,7 @@ def run(
                 user code file (default: None).
         """
         self._current_job_name = self._generate_current_job_name(job_name=job_name)
+        self.command = [_SparkProcessorBase._default_command]
 
         if not submit_app:
             raise ValueError("submit_app is required")
@@ -917,6 +919,7 @@ def run(
                 user code file (default: None).
         """
         self._current_job_name = self._generate_current_job_name(job_name=job_name)
+        self.command = [_SparkProcessorBase._default_command]
 
         if not submit_app:
             raise ValueError("submit_app is required")