version detection: Do not throw a raw error after the first warning

- Adjust the conditions to always assume a latest react version when e.code === 'MODULE_NOT_FOUND'
- The `warnedForMissingVersion` flag only controls the warning message and not the handling of the error

Ref: jsx-eslint#2276

lib/util/version.js

@@ -20,10 +20,12 @@ function detectReactVersion() {
     const react = require(reactPath); // eslint-disable-line import/no-dynamic-require
     return react.version;
   } catch (e) {
-    if (!warnedForMissingVersion && e.code === 'MODULE_NOT_FOUND') {
-      error('Warning: React version was set to "detect" in eslint-plugin-react settings, ' +
+    if (e.code === 'MODULE_NOT_FOUND') {
+      if (!warnedForMissingVersion) {
+        error('Warning: React version was set to "detect" in eslint-plugin-react settings, ' +
         'but the "react" package is not installed. Assuming latest React version for linting.');
-      warnedForMissingVersion = true;
+        warnedForMissingVersion = true;
+      }
       return '999.999.999';
     }
     throw e;