[ModelicaSystem] add ModelicaSystemError() for unhandled final else cases

there are a lot of functions which check the type of the input; this is
done by if ... elif ... - however, invalid input is not catched, i.e. there
is *NO* return value define (would be None) if the input is not matching
any of the if branches

Author: syntron

OMPython/ModelicaSystem.py

@@ -393,6 +393,8 @@ def getQuantities(self, names=None):  # 3
         elif isinstance(names, list):
             return [x for y in names for x in self.quantitiesList if x["name"] == y]
 
+        raise ModelicaSystemError("Unhandled input for getQuantities()")
+
     def getContinuous(self, names=None):  # 4
         """
         This method returns dict. The key is continuous names and value is corresponding continuous value.
@@ -437,6 +439,8 @@ def getContinuous(self, names=None):  # 4
                         raise ModelicaSystemError(f"OM error: {i} is not continuous")
                 return valuelist
 
+        raise ModelicaSystemError("Unhandled input for getContinous()")
+
     def getParameters(self, names=None):  # 5
         """
         This method returns dict. The key is parameter names and value is corresponding parameter value.
@@ -453,6 +457,8 @@ def getParameters(self, names=None):  # 5
         elif isinstance(names, list):
             return ([self.paramlist.get(x, "NotExist") for x in names])
 
+        raise ModelicaSystemError("Unhandled input for getParameters()")
+
     def getlinearParameters(self, names=None):  # 5
         """
         This method returns dict. The key is parameter names and value is corresponding parameter value.
@@ -479,6 +485,8 @@ def getInputs(self, names=None):  # 6
         elif isinstance(names, list):
             return ([self.inputlist.get(x, "NotExist") for x in names])
 
+        raise ModelicaSystemError("Unhandled input for getInputs()")
+
     def getOutputs(self, names=None):  # 7
         """
         This method returns dict. The key is output names and value is corresponding output value.
@@ -519,6 +527,8 @@ def getOutputs(self, names=None):  # 7
                         return (i, "is not Output")
                 return valuelist
 
+        raise ModelicaSystemError("Unhandled input for getOutputs()")
+
     def getSimulationOptions(self, names=None):  # 8
         """
         This method returns dict. The key is simulation option names and value is corresponding simulation option value.
@@ -535,6 +545,8 @@ def getSimulationOptions(self, names=None):  # 8
         elif isinstance(names, list):
             return ([self.simulateOptions.get(x, "NotExist") for x in names])
 
+        raise ModelicaSystemError("Unhandled input for getSimulationOptions()")
+
     def getLinearizationOptions(self, names=None):  # 9
         """
         This method returns dict. The key is linearize option names and value is corresponding linearize option value.
@@ -551,6 +563,8 @@ def getLinearizationOptions(self, names=None):  # 9
         elif isinstance(names, list):
             return ([self.linearOptions.get(x, "NotExist") for x in names])
 
+        raise ModelicaSystemError("Unhandled input for getLinearizationOptions()")
+
     def getOptimizationOptions(self, names=None):  # 10
         """
         usage:
@@ -565,6 +579,8 @@ def getOptimizationOptions(self, names=None):  # 10
         elif isinstance(names, list):
             return ([self.optimizeOptions.get(x, "NotExist") for x in names])
 
+        raise ModelicaSystemError("Unhandled input for getOptimizationOptions()")
+
     def get_exe_file(self) -> pathlib.Path:
         """Get path to model executable."""
         if platform.system() == "Windows":
@@ -687,12 +703,16 @@ def getSolutions(self, varList=None, resultfile=None):  # 12
             self.sendExpression("closeSimulationResultFile()")
             return npRes
 
+        raise ModelicaSystemError("Unhandled input for getSolutions()")
+
     def strip_space(self, name):
         if isinstance(name, str):
             return name.replace(" ", "")
         elif isinstance(name, list):
             return [x.replace(" ", "") for x in name]
 
+        raise ModelicaSystemError("Unhandled input for strip_space()")
+
     def setMethodHelper(self, args1, args2, args3, args4=None):
         """
         Helper function for setParameter(),setContinuous(),setSimulationOptions(),setLinearizationOption(),setOptimizationOption()