(#CALM-39370) fix task tree indents (#270)

### Summary
1. task tree decompile was failing due to indentation issues
2. context was not initialised when decompiling runbook

(cherry picked from commit d7f15ff1a630ff8bc508dd93d8e79bcea96304b0)

calm/dsl/cli/runbooks.py

@@ -19,6 +19,7 @@
 )
 from calm.dsl.decompile.decompile_render import create_runbook_dir
 from calm.dsl.decompile.file_handler import get_runbook_dir
+from calm.dsl.decompile.main import init_decompile_context
 from calm.dsl.runbooks import runbook, create_runbook_payload, RunbookType
 from calm.dsl.builtins.models.metadata_payload import get_metadata_payload
 from calm.dsl.config import get_context
@@ -189,7 +190,7 @@ def decompile_runbook_command(name, runbook_file, prefix="", runbook_dir=None):
     if name and runbook_file:
         LOG.error("Please provide either runbook file location or server runbook name")
         sys.exit("Both runbook name and file location provided.")
-
+    init_decompile_context()
     if name:
         decompile_runbook_from_server(name=name, runbook_dir=runbook_dir, prefix=prefix)
 

calm/dsl/decompile/decompile_helpers.py

@@ -143,31 +143,35 @@ def generate_indents(
         """
         while_tasks = special_tasks_data["while_tasks"]
         output = self.output
-        curr_indent = base_indent
-        if if_needed or else_needed:
-            curr_indent += 1
+        if_block_indent = None
+        else_block_indent = None
+        if if_needed:
+            if_block_indent = base_indent - 1
+        elif else_needed:
+            else_block_indent = base_indent - 1
+
         output.append(
             {
                 "task_name": curr_task,
-                "while_block_indent": curr_indent,
-                "task_indent": curr_indent,
+                "while_block_indent": base_indent,
+                "task_indent": base_indent,
                 "depth": depth,
-                "if_block_indent": base_indent - 1 if if_needed else None,
-                "else_block_indent": base_indent - 1 if if_needed else None,
+                "if_block_indent": if_block_indent,
+                "else_block_indent": else_block_indent,
             }
         )
         for task in while_tasks[curr_task]["child_tasks"]:
             if task.type in special_tasks_types:
                 helper = IndentHelper()
                 output += helper.generate_indents(
-                    special_tasks_data, task, curr_indent + 1, depth + 1, False, False
+                    special_tasks_data, task, base_indent + 1, depth + 1, False, False
                 )
             else:
                 output.append(
                     {
                         "task_name": task.name,
                         "while_block_indent": None,
-                        "task_indent": curr_indent + 1,
+                        "task_indent": base_indent + 1,
                         "depth": depth + 1,
                         "if_block_indent": None,
                         "else_block_indent": None,