fix(redis-creds): do not use redisUsername if its empty (#527)

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⚒️ Fixes  # <!--(issue)-->

**⚙️ Type of change**

- [ ] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

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- [ ] ⚖️ My code follows the style guidelines of this project
- [ ] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
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- [ ] 📄 I have made corresponding changes to the documentation
- [ ] ⚠️ My changes generate no new warnings
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
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**➕ App addition**

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- [ ] 🪞 I have opened a PR on
[truecharts/containers](https://github.com/truecharts/containers) adding
the container to TrueCharts mirror repo.
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library/common/Chart.yaml

@@ -15,4 +15,4 @@ maintainers:
 name: common
 sources: null
 type: library
-version: 14.0.6
+version: 14.0.7

library/common/templates/lib/dependencies/_redisInjector.tpl

@@ -15,11 +15,15 @@ This template generates a random password and ensures it persists across updates
     {{- $dbPass = (index $dbprevious.data "redis-password") | b64dec -}}
   {{- end -}}
 
+  {{- $redisUser := .Values.redis.redisUsername -}}
+  {{- if not $redisUser -}}{{/* If you try to print a nil value it will print as <nil> */}}
+    {{- $redisUser = "" -}}
+  {{- end -}}
   {{/* Prepare data */}}
   {{- $dbHost := printf "%v-%v" .Release.Name "redis" -}}
   {{- $portHost := printf "%v:6379" $dbHost -}}
-  {{- $url := printf "redis://%v:%v@%v/%v" .Values.redis.redisUsername $dbPass $portHost $dbIndex -}}
-  {{- $hostPass := printf "%v:%v@%v" .Values.redis.redisUsername $dbPass $dbHost -}}
+  {{- $url := printf "redis://%v:%v@%v/%v" $redisUser $dbPass $portHost $dbIndex -}}
+  {{- $hostPass := printf "%v:%v@%v" $redisUser $dbPass $dbHost -}}
 
   {{/* Append some values to redis.creds, so apps using the dep, can use them */}}
   {{- $_ := set .Values.redis.creds "redisPassword" ($dbPass | quote) -}}

library/common/templates/lib/imagePullSecret/_createData.tpl

@@ -21,7 +21,8 @@ objectData:
                             "email" (tpl .email $rootCtx) "auth" $auth) -}}
   {{- end -}}
 
-  {{- $_ := set $registrySecret "auths" (dict (tpl $objectData.data.registry $rootCtx) $registry) -}}
+  {{- $registryKey := tpl $objectData.data.registry $rootCtx -}}
+  {{- $_ := set $registrySecret "auths" (dict $registryKey $registry) -}}
 
   {{/*
   This should result in something like this: