Client crashes on logout if server is gone (dev env)
## Steps to reproduce

1. Launch development environment
2. Log in with client
3. Stop development environment
4. Log out with client

## Expected behavior

A friendly error message, encouraging the user to not give up hope

## Actual behavior

Client crash:

```
Traceback (most recent call last):
  File "/home/erik/Code/securedrop-client/securedrop_client/gui/widgets.py", line 516, in _on_logout_triggered
    self.controller.logout()
  File "/home/erik/Code/securedrop-client/securedrop_client/logic.py", line 471, in logout
    self.call_api(self.api.logout,
AttributeError: 'API' object has no attribute 'logout'
```
diff --git a/Makefile b/Makefile
index 6635db9..cf0ab18 100644
--- a/Makefile
+++ b/Makefile
@@ -57,7 +57,7 @@ safety: ## Runs `safety check` to check python dependencies for vulnerabilities
 .PHONY: bandit
 bandit: ## Run bandit with medium level excluding test-related folders
 	pip install --upgrade pip && \
-        pip install --upgrade bandit!=1.6.0 && \
+        pip install --upgrade bandit==1.5.1 && \
 	bandit -ll --recursive . --exclude tests,.venv
 
 .PHONY: check
diff --git a/securedrop_client/__init__.py b/securedrop_client/__init__.py
index 2792152..9123cf0 100644
--- a/securedrop_client/__init__.py
+++ b/securedrop_client/__init__.py
@@ -1 +1 @@
-__version__ = '0.0.7'
+__version__ = '0.0.8'
diff --git a/setup.py b/setup.py
index 0bf343f..a60ccbd 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@ for name in os.listdir('./securedrop_client/resources/images/'):
 
 setuptools.setup(
     name="securedrop-client",
-    version="0.0.7",
+    version="0.0.8",
     author="Freedom of the Press Foundation",
     author_email="securedrop@freedom.press",
     description="SecureDrop Workstation client application",
['Makefile', 'securedrop_client/__init__.py', 'setup.py']