Set minimum = 1 hours to show (#9466)

src/panels/lovelace/editor/config-elements/hui-graph-footer-editor.ts

@@ -81,6 +81,7 @@ export class HuiGraphFooterEditor
               "ui.panel.lovelace.editor.card.config.optional"
             )})"
             .value=${this._hours_to_show}
+            min="1"
             .configValue=${"hours_to_show"}
             @value-changed=${this._valueChanged}
           ></paper-input>

src/panels/lovelace/editor/config-elements/hui-logbook-card-editor.ts

@@ -85,6 +85,7 @@ export class HuiLogbookCardEditor
               "ui.panel.lovelace.editor.card.config.optional"
             )})"
             .value=${this._hours_to_show}
+            min="1"
             .configValue=${"hours_to_show"}
             @value-changed=${this._valueChanged}
           ></paper-input>

src/panels/lovelace/editor/config-elements/hui-sensor-card-editor.ts

@@ -177,6 +177,7 @@ export class HuiSensorCardEditor
             )})"
             type="number"
             .value=${this._hours_to_show}
+            min="1"
             .configValue=${"hours_to_show"}
             @value-changed=${this._valueChanged}
           ></paper-input>