use normal program flow to handle interrupts

freqtrade/__init__.py

@@ -1,4 +1,16 @@
 """ FreqTrade bot """
 __version__ = '0.14.3'
 
-from . import main
+
+class DependencyException(BaseException):
+    """
+    Indicates that a assumed dependency is not met.
+    This could happen when there is currently not enough money on the account.
+    """
+
+
+class OperationalException(BaseException):
+    """
+    Requires manual intervention.
+    This happens when an exchange returns an unexpected error during runtime.
+    """