Fix issue #2789: Respect context=[] in task execution

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/crew.py

@@ -876,7 +876,7 @@ class Crew(BaseModel):
     def _get_context(self, task: Task, task_outputs: List[TaskOutput]):
         context = (
             aggregate_raw_outputs_from_tasks(task.context)
-            if task.context
+            if task.context and len(task.context) > 0
             else aggregate_raw_outputs_from_task_outputs(task_outputs)
         )
         return context

tests/context_empty_list_test.py

@@ -0,0 +1,69 @@
+"""Test that context=[] is respected and doesn't include previous task outputs."""
+import pytest
+from unittest import mock
+from crewai import Agent, Task, Crew, Process
+from crewai.tasks.task_output import TaskOutput, OutputFormat
+from crewai.utilities.formatter import aggregate_raw_outputs_from_tasks, aggregate_raw_outputs_from_task_outputs
+
+def test_context_empty_list():
+    """Test that context=[] is respected and doesn't include previous task outputs."""
+    
+    
+    researcher = Agent(
+        role='Researcher',
+        goal='Research thoroughly',
+        backstory='You are an expert researcher'
+    )
+    
+    task_with_empty_context = Task(
+        description='Task with empty context',
+        expected_output='Output',
+        agent=researcher,
+        context=[]  # Explicitly set context to empty list
+    )
+    
+    task_outputs = [
+        TaskOutput(
+            description="Previous task output",
+            raw="Previous task result",
+            agent="Researcher",
+            json_dict=None,
+            output_format=OutputFormat.RAW,
+            pydantic=None,
+            summary="Previous task result",
+        )
+    ]
+    
+    crew = Crew(
+        agents=[researcher],
+        tasks=[task_with_empty_context],
+        process=Process.sequential,
+        verbose=False
+    )
+    
+    with mock.patch('crewai.agent.Agent.execute_task') as mock_execute:
+        mock_execute.return_value = "Mocked execution result"
+        
+        context = crew._get_context(task_with_empty_context, task_outputs)
+        
+        # So it should return the aggregated task_outputs
+        expected_context = aggregate_raw_outputs_from_task_outputs(task_outputs)
+        
+        assert context == expected_context
+        
+        assert not (task_with_empty_context.context and len(task_with_empty_context.context) > 0)
+        
+        other_task = Task(
+            description='Other task',
+            expected_output='Output',
+            agent=researcher
+        )
+        
+        task_with_context = Task(
+            description='Task with context',
+            expected_output='Output',
+            agent=researcher,
+            context=[other_task]  # Non-empty context
+        )
+        
+        assert task_with_context.context and len(task_with_context.context) > 0