Kill unnecessary startup exceptions (#17161)

* Atomization

* dsaf

* Apply suggestions from code review

Co-authored-by: SleepyGemmy <99297919+SleepyGemmy@users.noreply.github.com>

---------

Co-authored-by: FluffyGhost <FluffyGhost>
Co-authored-by: SleepyGemmy <99297919+SleepyGemmy@users.noreply.github.com>

code/controllers/subsystems/cargo.dm

@@ -170,6 +170,11 @@ var/datum/controller/subsystem/cargo/SScargo
 //Loads the cargo data from JSON
 /datum/controller/subsystem/cargo/proc/load_from_json()
 	var/list/cargoconfig = list()
+
+	if(!isfile("config/cargo.json"))
+		log_config("The file config/cargo.json was not found, cargo items will not be loaded.")
+		return
+
 	try
 		cargoconfig = json_decode(return_file_text("config/cargo.json"))
 	catch(var/exception/ej)

code/controllers/subsystems/chemistry.dm

@@ -129,6 +129,11 @@ var/datum/controller/subsystem/chemistry/SSchemistry
 /datum/controller/subsystem/chemistry/proc/load_secret_chemicals()
 	. = 0
 	var/list/chemconfig = list()
+
+	if(!isfile("config/secretchem.json"))
+		log_config("The file config/secretchem.json was not found, secret chemicals will not be loaded.")
+		return
+
 	try
 		chemconfig = json_decode(return_file_text("config/secretchem.json"))
 	catch(var/exception/e)