F file read error

Summary

See #30 (closed). Having an empty path for the certificate leads to a vanilla basic iostream error

Focus

The basic exception is caught and changed into a slightly more precise Exception with error code.

Test Environment

e.g. set cert path to empty string and try to connect

Check List for the Author

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• All automated tests pass
• Reference related Issues
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  • Intent of new code
  • Problems with old code
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
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include/caosdb/exceptions.h

@@ -101,12 +101,12 @@ public:
 };
 
 /**
- * @brief The connection isn't known to the ConnectionManager under this name.
+ * @brief Exception for errors during the configuration of the connection.
  */
-class UnknownConnectionError : public Exception {
+class ConnectionConfigurationError : public Exception {
 public:
-  explicit UnknownConnectionError(const std::string &what_arg)
-    : Exception(StatusCode::UNKNOWN_CONNECTION_ERROR, what_arg) {}
+  explicit ConnectionConfigurationError(const std::string &what_arg)
+    : Exception(StatusCode::CONNECTION_CONFIGURATION_ERROR, what_arg) {}
 };
 
 } // namespace caosdb::exceptions