experimental remove of throwing exceptions when module loading

SQUASHED: AUTO-COMMIT-src-client-tree-sitter.js,AUTO-COMMIT-src-external-systemjs-system.6.14.js,AUTO-COMMIT-src-systemjs-config.js,

src/client/tree-sitter.js

@@ -2,6 +2,7 @@
 [test](edit://test/tree-sitter-test.js) [demo](browse://demos/tree-sitter/matches.md)
 
 MD*/
+
 import PriorityQueue from "src/external/priority-queue.js"
 import _ from 'src/external/lodash/lodash.js'
 

src/external/systemjs/system.6.14.js

@@ -724,7 +724,13 @@
   };
 
   function throwUnresolved (id, parentUrl) {
-    throw Error(errMsg(8, "Unable to resolve bare specifier '" + id + (parentUrl ? "' from " + parentUrl : "'")));
+    // BEGIN Lively4 Modification
+    if (systemJSPrototype.throwUnresolved) {
+      return systemJSPrototype.throwUnresolved(id, parentUrl)
+    } else {
+      throw Error(errMsg(8, "Unable to resolve bare specifier '" + id + (parentUrl ? "' from " + parentUrl : "'")));
+    }
+    // END Lively4 Modification
   }
 
   var systemInstantiate = systemJSPrototype.instantiate;

src/systemjs-config.js

@@ -169,6 +169,8 @@ async function systemFetch(url, options) {
 systemJSPrototype.fetch = systemFetch
 
 
+
+
 systemJSPrototype.shouldFetch = function () {
   return true;
 };
@@ -633,6 +635,15 @@ function systemResolve(id, parentUrl) {
   } catch(e) {
     result = orginalResolve.call(this, lively4url + "/" + id, parentUrl) // try harder!
   }
+  if (!result) {
+     result = orginalResolve.call(this, lively4url + "/" + id, parentUrl) // try harder! new version without exceptions
+
+    // throw Error("Unable to resolve  " + id + " in " + parentUrl)
+  }
+  if (!result) {
+    throw Error("Unable to resolve  " + id + " in " + parentUrl)
+  }
+
   result  = result.replace(/([^:]\/)\/+/g, "$1"); // remove double slashes 
 
   // #TODO maybe use this browser API to resolve id in parentUrl 
@@ -642,6 +653,15 @@ function systemResolve(id, parentUrl) {
 }
 systemResolve.originalFunction = orginalResolve
 
+// Lively4 introduced custom hook to prevent throwing an error
+systemJSPrototype.throwUnresolved = function(id, parentUrl) {
+  // console.warn("SYSTEMJS could not resolve " + id + " in " + parentUrl)
+  // throw new Error("could not resolve " + id + " in " + parentUrl)
+
+  return false // do nothing
+}
+
+
 System.constructor.prototype.resolve = systemResolve
 System.constructor.prototype.normalizeSync = systemResolve